I bought Elaine Gottschall's Breaking the Vicious Cycle: Intestinal Health Through Diet because it specifically discusses healing ulcerative colitis and it seems like another resource to learn about this healing way of eating. I was surprised to see all the recipes contained in it.
I am on Intro, Day One of Stage Two. And Onion Gravy is okay for intro!
Hubby made a roast in the crockpot today, with an onion, carrots, celery and garlic cloves [affiliate link]. The recipe is very simple, and I think a nice substitution for gravy.
Basically you just take one cup of stock with one cup of cooked onion and blend it up. I put the whole cooked onion into my blender, then added about half cup of the stock. I like the little bits and dribs and drabs in the stock so I didn't want to thoroughly blend it all up. You might want to blend the whole cup of stock.
Anyway, that's it. It was moderately thick, and seemed to separate a bit on my plate after a few minutes. But all in all, I think a good substitute for gravy.
Let me know if you try it.