I sometimes have a lot of hop trub at the bottom of the boiler after siphoning off the wort. I let some go through the siphon. If there's a lot left, I pour it into a muslin-lined funnel over a jug (all sanitised). Over an hour or so the liquid drains out - usually enough for another couple of bottle of beer. Not a great deal, but it has a lot of hop flavour that would otherwise go to waste.
This seems like a great idea. I'll have to try it.
I had a little something similar after I was done draining the liquid from a steeping grain bag into the brew kettle. I drained as much as I could but then after adding DME to the kettle and after the hot break when I could relax a bit I noticed that the muslin bag I had placed aside had leaked a few extra ounces of goodness into the pan I set it in. I was like "oh wow, there's body in there!" I was so tempted to add to the boiling wort and probably should have. This was a stout I was brewing so that liquid was full of coffee and chocolate notes.
No prob, added to my morning coffee the next day. Delicious!