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General Category => Ingredients => Topic started by: yso191 on November 19, 2014, 09:45:05 PM

Title: Onion in my IPA
Post by: yso191 on November 19, 2014, 09:45:05 PM
As I mentioned in a post elsewhere, my most recent IPA has an onion flavor to it.  I understand from other reading that this will dissipate.  My question is should I flush CO2 out of the keg?  Would that speed the process?
Title: Re: Onion in my IPA
Post by: flbrewer on November 19, 2014, 11:00:42 PM
Hmmm, I recall there being a specific hop that has that flavor. Anyone? I know Oskar Blues Gubna' has that common complaint.
Title: Re: Onion in my IPA
Post by: HoosierBrew on November 19, 2014, 11:02:58 PM
Yeah, I would cycle CO2 through the prv a few times to hopefully vent some of that out, Steve.  I've had it happen a few times and it seems to help usually. I think Martin posted before about pouring a beer that seemed heavy on onion/garlic aromas, letting it sit for a few minutes and noticing that the nastiness had dissipated and the beer was great. The only really stubborn onion/garlic for me came from Summit......a few times. Life's too short and there are too many great new hops to risk another 5 gallons on that crap. I know it CAN have a nice aroma and flavor, but it is very prone to the onion soup thing.
Title: Re: Onion in my IPA
Post by: Stevie on November 19, 2014, 11:04:07 PM

Hmmm, I recall there being a specific hop that has that flavor. Anyone? I know Oskar Blues Gubna' has that common complaint.
Summit hops. I've never tasted it personally, but people have said there is an onion and garlic note to them.

Steve - did you use summit?
Title: Re: Onion in my IPA
Post by: yso191 on November 19, 2014, 11:09:19 PM
No Summit.  Amarillo, Citra and Mosaic.  I have heard that Mosaic can lend a little onion to the soup.  I'm headed out to purge the headspace!
Title: Re: Onion in my IPA
Post by: HoosierBrew on November 19, 2014, 11:13:24 PM
No Summit.  Amarillo, Citra and Mosaic.  I have heard that Mosaic can lend a little onion to the soup.  I'm headed out to purge the headspace!

I've picked it up slightly from Citra a time or two and it dissipated. Not yet from Mosaic though and I've used a fair amount. I wish someone would do a solid study on that, to give some real data. So far it's looking harvest related but it seems like speculation right now.
Title: Re: Onion in my IPA
Post by: morticaixavier on November 19, 2014, 11:41:13 PM
No Summit.  Amarillo, Citra and Mosaic.  I have heard that Mosaic can lend a little onion to the soup.  I'm headed out to purge the headspace!

I've picked it up slightly from Citra a time or two and it dissipated. Not yet from Mosaic though and I've used a fair amount. I wish someone would do a solid study on that, to give some real data. So far it's looking harvest related but it seems like speculation right now.

I had a citra smash IPA last night at brew club that had a hint of onion along with the mango and cat pee. It was very subtle in that beer and faded almost as soon as I noticed it in the first place.
Title: Re: Onion in my IPA
Post by: HoosierBrew on November 19, 2014, 11:47:45 PM
No Summit.  Amarillo, Citra and Mosaic.  I have heard that Mosaic can lend a little onion to the soup.  I'm headed out to purge the headspace!

I've picked it up slightly from Citra a time or two and it dissipated. Not yet from Mosaic though and I've used a fair amount. I wish someone would do a solid study on that, to give some real data. So far it's looking harvest related but it seems like speculation right now.

I had a citra smash IPA last night at brew club that had a hint of onion along with the mango and cat pee. It was very subtle in that beer and faded almost as soon as I noticed it in the first place.

Yeah, it normally dissipates pretty quickly (except for Summit, which could be used in a meat marinade). I've tried to narrow down boil time vs dry hop vs quantities and it seems random to me. Seems to give the harvest time/terroir theory some legs.
Title: Re: Onion in my IPA
Post by: fmader on November 20, 2014, 12:21:02 AM
No Summit.  Amarillo, Citra and Mosaic.  I have heard that Mosaic can lend a little onion to the soup.  I'm headed out to purge the headspace!

I won't use Mosaic again because of this.
Title: Re: Onion in my IPA
Post by: Stevie on November 20, 2014, 01:01:09 AM
I use mosaic all the time. Started when I couldn't get Simcoe for a reasonable price. Got a pound of mosaic from yakima for $22.
Title: Re: Onion in my IPA
Post by: HoosierBrew on November 20, 2014, 01:16:12 AM
I use mosaic all the time. Started when I couldn't get Simcoe for a reasonable price. Got a pound of mosaic from yakima for $22.

I remember 2 or 3 years back some of the people here went to NHC and posted about the beers made with (then) experimental new hops. Most guys thought that what was the Mosaic beer was by far the best. And like you said it was a lot cheaper at the time than Simcoe, so I got a lb from YVH.
Title: Re: Onion in my IPA
Post by: dmtaylor on November 20, 2014, 03:34:53 AM
I've heard Sorachi Ace hops also have this onion/garlic thing when young, but fortunately this always fades to leave a unique tea-like flavor that is extremely pleasant!
Title: Re: Onion in my IPA
Post by: Stevie on November 20, 2014, 03:49:49 AM

I use mosaic all the time. Started when I couldn't get Simcoe for a reasonable price. Got a pound of mosaic from yakima for $22.

I remember 2 or 3 years back some of the people here went to NHC and posted about the beers made with (then) experimental new hops. Most guys thought that what was the Mosaic beer was by far the best. And like you said it was a lot cheaper at the time than Simcoe, so I got a lb from YVH.

If you have a chance to try Mosaic IPA by Community out of Dallas, do it. It's not single hop, but it is amazing. Best IPA in north Texas by far. I killed a growler one night by accident. The lady was not impressed.
Title: Re: Onion in my IPA
Post by: dannyjed on November 20, 2014, 03:53:08 AM
I've heard Sorachi Ace hops also have this onion/garlic thing when young, but fortunately this always fades to leave a unique tea-like flavor that is extremely pleasant!
I agree. Some aging should help. My wife and I have detected some diesel flavor from young beers with mosaic hops that eventually turn out very tasty.
Title: Re: Onion in my IPA
Post by: majorvices on November 20, 2014, 10:06:30 AM
Didn't someone post recently that the onion/garlic thing may come from hops harvested too late in the season? I've definitely gotten onion/garlic in summit. I find beers made with summit very unpleasant.
Title: Re: Onion in my IPA
Post by: HoosierBrew on November 20, 2014, 12:48:06 PM
I've heard Sorachi Ace hops also have this onion/garlic thing when young, but fortunately this always fades to leave a unique tea-like flavor that is extremely pleasant!

I've never noticed it in Sorachi (yet).  Good hop though - I love the lemony aspect in saison. Good stuff.
Title: Re: Onion in my IPA
Post by: hopfenundmalz on November 20, 2014, 01:07:35 PM
Didn't someone post recently that the onion/garlic thing may come from hops harvested too late in the season? I've definitely gotten onion/garlic in summit. I find beers made with summit very unpleasant.

I heard that at a talk or a podcast too. Hops like Summit are sold on high AA, so they are left longer on the bine to maximize AA, and the sulfur compound that causes the onion/garlic goes up also.
Title: Re: Onion in my IPA
Post by: klickitat jim on November 20, 2014, 01:44:12 PM
No Summit.  Amarillo, Citra and Mosaic.  I have heard that Mosaic can lend a little onion to the soup.  I'm headed out to purge the headspace!
You sure those little purple hops weren't shallots?
Title: Re: Onion in my IPA
Post by: HoosierBrew on November 20, 2014, 02:14:36 PM

I heard that at a talk or a podcast too. Hops like Summit are sold on high AA, so they are left longer on the bine to maximize AA, and the sulfur compound that causes the onion/garlic goes up also.

Makes sense, but I wonder if Summit isn't naturally higher in the sulfur compound, too. That stuff seems to dissipate fairly quickly when I get it from other hops, but not from Summit.
Title: Re: Onion in my IPA
Post by: kramerog on November 20, 2014, 02:59:34 PM
I've used Summit once without any onion in a hop stand and the beer was delicious.  I've heard that copper will eliminate the sulfur compounds that gives the onion character.
Title: Re: Onion in my IPA
Post by: erockrph on November 20, 2014, 03:06:54 PM
I've heard of copper reacting with SO2 gas to create copper sulfate, but I haven't seen the same data showing that it reacts with thiols to remove onion flavors.

I have gotten onion from Mosaic before. FWIW, I believe it was from 2013 whole cone hops from freshops. I only ever picked it up in a single hop beer - I've never picked out onion in any other beers I've brewed with that batch.
Title: Re: Onion in my IPA
Post by: Stevie on November 20, 2014, 03:16:27 PM
I have been having funny issues with my stove top batches. No copper involved. Might throw a chunk of tubing in the kettle next batch.
Title: Re: Onion in my IPA
Post by: HoosierBrew on November 20, 2014, 03:27:11 PM
I use my copper IC pre and post hop stand, and I generally don't have the issues. And like I posted, the occasional onion note dissipates quickly, except for Summit.
Title: Re: Onion in my IPA
Post by: Stevie on November 20, 2014, 03:42:20 PM

I use my copper IC pre and post hop stand, and I generally don't have the issues. And like I posted, the occasional onion note dissipates quickly, except for Summit.
Have not built my mini chiller yet. I've bath for the small batches.
Title: Re: Onion in my IPA
Post by: HoosierBrew on November 20, 2014, 03:45:55 PM

I use my copper IC pre and post hop stand, and I generally don't have the issues. And like I posted, the occasional onion note dissipates quickly, except for Summit.
Have not built my mini chiller yet. I've bath for the small batches.

Didn't think of the small batch thing. A mini chiller is a great idea. I do small batches now and then to try hops. Can't say I'm getting onion more often with those though, and I just ice bath them too.
Title: Re: Onion in my IPA
Post by: denny on November 20, 2014, 05:29:57 PM
No Summit.  Amarillo, Citra and Mosaic.  I have heard that Mosaic can lend a little onion to the soup.  I'm headed out to purge the headspace!

What I learned at Hop and Brew School is that onion/garlic is often related to time of harvest, not necessarily a single variety.

Didn't someone post recently that the onion/garlic thing may come from hops harvested too late in the season? I've definitely gotten onion/garlic in summit. I find beers made with summit very unpleasant.

I believe that was me.
Title: Re: Onion in my IPA
Post by: narcout on November 20, 2014, 06:28:26 PM
Didn't someone post recently that the onion/garlic thing may come from hops harvested too late in the season? I've definitely gotten onion/garlic in summit. I find beers made with summit very unpleasant.

This was also discussed in For the Love of Hops.
Title: Re: Onion in my IPA
Post by: beersk on November 20, 2014, 06:47:17 PM
No Summit.  Amarillo, Citra and Mosaic.  I have heard that Mosaic can lend a little onion to the soup.  I'm headed out to purge the headspace!
You sure those little purple hops weren't shallots?
Nice contribution, Jim.

I didn't notice onion/garlic in last year's crop of Amarillo, but something was funky about it. Every beer I've brewed with 2013 Amarillo has tasted kinda funny to me.
Title: Re: Onion in my IPA
Post by: AnimALE on November 20, 2014, 09:06:57 PM
No Summit.  Amarillo, Citra and Mosaic.  I have heard that Mosaic can lend a little onion to the soup.  I'm headed out to purge the headspace!

I won't use Mosaic again because of this.

Mosaic is a crazy hops..one time it will be like fruits very simcoe like another time it was like sweaty armpits..unpredicable hop IMO
Title: Re: Onion in my IPA
Post by: dmtaylor on November 21, 2014, 01:21:57 AM
Mosaic is a crazy hops..one time it will be like fruits very simcoe like another time it was like sweaty armpits..unpredicable hop IMO

So, either way, it kind of sucks.   8)

Mosaic and Simcoe... my two least favorite hops.  Personal preference.
Title: Re: Onion in my IPA
Post by: hopfenundmalz on November 21, 2014, 01:46:29 AM
Mosaic is a crazy hops..one time it will be like fruits very simcoe like another time it was like sweaty armpits..unpredicable hop IMO

So, either way, it kind of sucks.   8)

Mosaic and Simcoe... my two least favorite hops.  Personal preference.

Mosaic is a daughter of Simcoe, so there you go! I actually like Simcoe, and really like Mosaic. We all have our taste preferences.
Title: Re: Onion in my IPA
Post by: yso191 on November 21, 2014, 06:46:39 AM
Well the onion is gone... and so is all the flavor.  So weird, so frustrating.  Had a pint tonight and it was like drinking fizz water.  Ok that is hyperbole, but still.  I used 13 oz. apparently to no avail:

2.00 oz Amarillo [8.80 %] - Boil 5.0 min
2.00 oz Citra [14.10 %] - Boil 5.0 min
2.00 oz Citra [14.10 %] - Steep/Whirlpool
2.00 oz Mosaic [12.70 %] - Steep/Whirlpool 
3.00 oz Mosaic [12.70 %] - Dry Hop 5.0 Days
2.00 oz Citra [14.10 %] - Dry Hop 5.0 Days

We'll see if it comes around again.  I've heard of wine doing that.  Pretty disgusted right now.
Title: Re: Onion in my IPA
Post by: klickitat jim on November 21, 2014, 06:48:38 AM
Thats strange
Title: Re: Onion in my IPA
Post by: majorvices on November 21, 2014, 01:12:09 PM
Well the onion is gone... and so is all the flavor.  So weird, so frustrating.  Had a pint tonight and it was like drinking fizz water.  Ok that is hyperbole, but still.  I used 13 oz. apparently to no avail:

2.00 oz Amarillo [8.80 %] - Boil 5.0 min
2.00 oz Citra [14.10 %] - Boil 5.0 min
2.00 oz Citra [14.10 %] - Steep/Whirlpool
2.00 oz Mosaic [12.70 %] - Steep/Whirlpool 
3.00 oz Mosaic [12.70 %] - Dry Hop 5.0 Days
2.00 oz Citra [14.10 %] - Dry Hop 5.0 Days

We'll see if it comes around again.  I've heard of wine doing that.  Pretty disgusted right now.

Two things that come to mind that will seemingly remove hop flavor and aroma. Overcarbonation and too cold a serving pressure. Any chance this is the case?
Title: Re: Onion in my IPA
Post by: yso191 on November 21, 2014, 05:13:33 PM
Two things that come to mind that will seemingly remove hop flavor and aroma. Overcarbonation and too cold a serving pressure. Any chance this is the case?

Serving temp of 38*.  I do have a new CO2 regulator that I'm about to replace because it won't hold a steady pressure.  So I'm guessing that is it.  It didn't seem overly carbonated to my tongue but the two thresholds may have different levels.

Thanks for the tip, I didn't know that!
Title: Re: Onion in my IPA
Post by: klickitat jim on November 21, 2014, 05:37:31 PM
38 seems about 10 too low
Title: Re: Onion in my IPA
Post by: fmader on November 21, 2014, 05:49:09 PM
I serve mine 38-40. I've not experienced hop loss. How long have you been serving at this temp? Have you served other hoppy beers at this temp? Did they lose aroma/or flavor?

Did you have a bittering addition in this brew?

Title: Re: Onion in my IPA
Post by: HoosierBrew on November 21, 2014, 06:13:35 PM
I like 42-43ish for IPA, fwiw.   Steve, I'm assuming the aroma was strong but slightly onion-y before ? I've run into this  - sort of - but not as extreme as you describe.  So I'll tell you what I think I've learned :    1/ I'm prone to sinus issues now and then. There've been times I wondered where the aroma went and the next day I could breathe easier and hop aromas magically came right back.     2/  When I used to dry hop in primary - ie., with more yeast in suspension - I felt that as the beer in the keg gradually cleared, dry hop character fell off as the remaining yeast (which absorb hop oils) settle out in keg. I wait to dry hop (in the keg) now until ~ 3 weeks, to get the clearest beer I can to dry hop. I feel the dry hop character lasts longer this way.     3/  Worst case, mesh bag up some varieties that you've used without any onion and drop them in the keg. I do it all the time. It won't have the same intensity as room temp dry hops (use more than @ room temp, if need be) but it'll wake it up.
Title: Re: Onion in my IPA
Post by: yso191 on November 21, 2014, 09:06:48 PM
I've served IPAs at 35* and not lost flavor.  Add to that the bottles of commercial IPAs in my fridge that do just fine at 33-34*.

Yes, on the bittering addition: one 10 ml hopshot at 60 minutes.

The hydrometer sample that I collected at kegging smelled wonderful, and tasted quite good even prior to any carbonation.  I did forget to dump the yeast prior to dry-hopping this time, so that could contribute, but I didn't have any issues when I was fermenting and dry-hopping in a carboy.

I do think the carbonation is the best bet at this point, but I'm regularly amazed at the stark difference a day can make.  I don't know if it is my tastebuds being ruined by something I ate, or my body's chemistry is different, minor allergies, or what, but one day a beer will be marvelous and the next boring - so that may be it too.
Title: Re: Onion in my IPA
Post by: Iliff Ave Brewhouse on November 21, 2014, 09:11:08 PM
I am glad I am not alone on this. I feel like my palate is slightly different day to day. I will pour a beer and it will taste different than I remember from just the day before. Sometimes better, sometimes worse. I have a love/hate relationship with my current APA on tap. Sometimes is tastes to dry and earthy and other days it's just what I want in house APA.

Title: Re: Onion in my IPA
Post by: narcout on November 22, 2014, 12:19:09 AM
one day a beer will be marvelous and the next boring

This happens to me as well.
Title: Re: Onion in my IPA
Post by: klickitat jim on November 22, 2014, 12:32:22 AM
Ok so my temp comment was stupid. I forgive myself. (I'm smart, I'm good looking, and dang it people like me) All better.

It can be very difficult to diagnose beer flavor swing from a distance,  especially when you account for palate fatigue or taste bud mood swings. If you have another example that is supposed to be very similar, have someone serve you 3 samples, one being the questionable beer, or two being the questionable beer and one of the control sample. Without being able to see a difference (eyes closed maybe) see if you can pick out the questionable beer.
Title: Re: Onion in my IPA
Post by: HoosierBrew on November 22, 2014, 12:38:43 AM
Ok so my temp comment was stupid. I forgive myself. (I'm smart, I'm good looking, and dang it people like me) All better.


:)
Title: Re: Onion in my IPA
Post by: HoosierBrew on November 22, 2014, 01:19:20 AM
Steve - is the hop character any better tonight ?
Title: Re: Onion in my IPA
Post by: yso191 on November 22, 2014, 06:43:51 AM
Steve - is the hop character any better tonight ?

Yes!  I swapped out the CO2 regulator this afternoon, though I'm not sure that was the issue now.  Now I'm thinking it was the homemade Zuppa Toscana I had for dinner prior to the IPA.

It is still not and exceptionally good IPA, but it is solidly in the good category.  Geeze, maybe by tomorrow...
Title: Re: Onion in my IPA
Post by: HoosierBrew on November 22, 2014, 12:36:30 PM
Steve - is the hop character any better tonight ?

Yes!  I swapped out the CO2 regulator this afternoon, though I'm not sure that was the issue now.  Now I'm thinking it was the homemade Zuppa Toscana I had for dinner prior to the IPA.

It is still not and exceptionally good IPA, but it is solidly in the good category.  Geeze, maybe by tomorrow...

Awesome !
Title: Re: Onion in my IPA
Post by: Chas on August 07, 2017, 02:43:49 PM
Old thread but helpful. I get this every time I brew a sculpin clone which has a decent amount of Amarillo in it. So discouraging when this happens. I'll try the purge and let it age some
Title: Re: Onion in my IPA
Post by: el_capitan on August 15, 2017, 04:32:38 AM
My .02, late to the party - The only time I've gotten onion is when I did a single-hop IPA with Zeus.  Too much of a good thing, I guess.  However, they were homegrown hops, and there is a chance that it was a late harvest issue. 
Title: Re: Onion in my IPA
Post by: denny on August 15, 2017, 03:35:40 PM
I was told at Hop and Brew School that onion/garlic is a sign the hops were harvested too late.  If that's the case, another lot of hops might be fine.
Title: Re: Onion in my IPA
Post by: HoosierBrew on August 15, 2017, 03:46:50 PM
I've heard the same. In that case, a whole lot of Summit must get harvested late.  ;D  Rarely used it without the onion/garlic.
Title: Re: Onion in my IPA
Post by: denny on August 15, 2017, 04:21:06 PM
I've heard the same. In that case, a whole lot of Summit must get harvested late.  ;D  Rarely used it without the onion/garlic.

And I've only gotten it once in frequent use of Summit.  I love that hop.  But each variety does have a specific harvest time.
Title: Re: Onion in my IPA
Post by: Steve Ruch on August 15, 2017, 10:12:37 PM
I've heard the same. In that case, a whole lot of Summit must get harvested late.  ;D  Rarely used it without the onion/garlic.

And I've only gotten it once in frequent use of Summit.  I love that hop.  But each variety does have a specific harvest time.

I must be really lucky as I've never gotten onion with it.
Title: Re: Onion in my IPA
Post by: zwiller on August 16, 2017, 03:50:50 PM
Never got onion with summit but never got that orange/tangerine thing either... 
Title: Re: Onion in my IPA
Post by: HoosierBrew on August 16, 2017, 04:19:33 PM
Shows the variability in hop retailers and harvest, I guess. I use different retailers and have gotten onion/garlic easily 75% of the time from it, sometimes strong. I've seen a couple people post similarly about Mosaic and I've had nothing but good luck with it. Lots of variables to getting good hops evidently.
Title: Re: Onion in my IPA
Post by: Chas on August 23, 2017, 01:06:45 PM
Does this onion flavor fade at all or is it something I'm stick with? Thanks in advance!
Title: Re: Onion in my IPA
Post by: dmtaylor on August 23, 2017, 02:14:52 PM
Does this onion flavor fade at all or is it something I'm stick with? Thanks in advance!

I don't have personal experience, but I've heard many say that yes, it does fade after just a couple weeks.
Title: Re: Onion in my IPA
Post by: erockrph on August 23, 2017, 03:34:14 PM
Does this onion flavor fade at all or is it something I'm stick with? Thanks in advance!

I don't have personal experience, but I've heard many say that yes, it does fade after just a couple weeks.
My all-Summit Pale Ale still tasted like onion rings till the day I dumped the last of the bottles about 3 years later.
Title: Re: Onion in my IPA
Post by: dmtaylor on August 23, 2017, 06:07:23 PM
Does this onion flavor fade at all or is it something I'm stick with? Thanks in advance!

I don't have personal experience, but I've heard many say that yes, it does fade after just a couple weeks.
My all-Summit Pale Ale still tasted like onion rings till the day I dumped the last of the bottles about 3 years later.

Ooh........ very sorry to hear that.  If it's any consolation, my DIPA tastes like a tub of movie popcorn butter.  I haven't popped a bottle of that stuff in about 5 months.  Maybe it's better now.  Otherwise I'm thinking about pouring it all back into a fermenter and adding Brett, just for the fun of it.
Title: Re: Onion in my IPA
Post by: erockrph on August 26, 2017, 06:25:30 PM
Does this onion flavor fade at all or is it something I'm stick with? Thanks in advance!

I don't have personal experience, but I've heard many say that yes, it does fade after just a couple weeks.
My all-Summit Pale Ale still tasted like onion rings till the day I dumped the last of the bottles about 3 years later.

Ooh........ very sorry to hear that.  If it's any consolation, my DIPA tastes like a tub of movie popcorn butter.  I haven't popped a bottle of that stuff in about 5 months.  Maybe it's better now.  Otherwise I'm thinking about pouring it all back into a fermenter and adding Brett, just for the fun of it.

Thankfully, it was a 1-gallon batch. It was a great beer to cook with, though :)
Title: Re: Onion in my IPA
Post by: yso191 on August 27, 2017, 05:20:21 PM
Does this onion flavor fade at all or is it something I'm stick with? Thanks in advance!

I don't have personal experience, but I've heard many say that yes, it does fade after just a couple weeks.
My all-Summit Pale Ale still tasted like onion rings till the day I dumped the last of the bottles about 3 years later.

I wonder if kegging would be better for an onion beer.  What I'm thinking is that one could purge the CO2 in the head space which may flush it out. 
Title: Re: Onion in my IPA
Post by: Chas on September 01, 2017, 09:17:02 PM
Update: since I was considering dumping it (nothing to lose) and did not gelatin fine this during cold crash, I decided to do it now. What I mean is, after drinking one gallon of carbed beer that tasted like onions, I purged it, opened it and added gelatin (1/4 cup of 150 degree water with 1/2 tsp gelatin). I then purged again after adding co2 to try and clear out oxygen.  I then gave away about a gallon of it to a friend (I guess I'm not a great friend!) to try and get this thing empty (we've all done it!).Then, after trying it last night out of curiosity, I was blown how different this beer is and how close it is to sculpin. I've never had a beer change that much.  This is not best practice stuff, but this is one of the few experimental things that have worked to fix a beer I've ever done. My thought process (which was probably very flawed) was that whatever oil from the hops that was in the beer that was giving me the onion flavor could possibly drop out through fining. I think that may have actually happened here. Just thought I'd share.
The crazy thing is, I'm picking up malt in the beer now too. Light, but it was not perceptible before fining.
If anyone would be helped by seeing the original recipe, I'll make sure to post it. Thanks!