I've used these guys but to tell the truth I didn't shop around because I consider it a commodity without much difference between one supplier and another
http://shop.greatfermentations.com/product/bitter-orange-peel-1-oz/beer-brewing-herbs-spices
Sent from my iPad using Tapatalk
That's a nice closeup photo. Do you recall if, when you bought it, what they sent was Brewer's Best which seems to be the primary provider in their herbs and spices section.
In my experience I've bought some that had a lot of pith and big pieces that was pretty blah, and I have some that I got from another provider that is fairly fine ground with very little white pith, but they since have gone to Brewer's Best, which is unknown to me.
In Radical Brewing, which was published a long time ago, Mosher recommends avoiding commercially purchased bitter orange peel since it typically can be bitter or flavorless, but I've heard some different opinions, and am wondering if there is some tried and true product out there somewhere.
My understanding is that some of the taste characteristics of actual bitter orange, found in some authentic Belgian ales, etc., such as its floral qualities, cannot be replicated by substituting a combination of fresh sweet orange peel plus a lesser amount of grapefruit peel like many brewers use, and as recommended by Mosher in Radical Brewing.
I'm trying to see what options there are for more successfully imitating Belgian brews that use it, and just a feel for a good source.
I also emailed the supplier you metioned to see what is the source they use.