I'm using the bagel recipe from _The Bread Baker's Apprentice_. The bagels are excellent, but I've been having trouble flavoring them onion. I'm taking dehydrated onion, rehydrating it. Then I press the water out, and use that water to put into the sponge. I take the semi dry onion bits and hand knead them into the dough. This is a big mess, and makes the dough really slimy for a while. It dries out, but not as nice without any flavoring. I tried onion powder and granuals, but I didn't get a good flavor. I tried putting an egg wash on the bagel, and sticking the rehydrated bits on top. This was very good, but the singed tops tasted awful after freezing and thawing.
How should I approach this classic flavor?
Thanks!