I have had a J Pouch for 25 years and eat cabbage and sauerkraut regularly. I believe eating yogurts and fermented foods with natural probiotics has improved my Pouch function rather substantially. Which is important since I take antibiotics and Remicade chronically for Pouch inflammation.
Ironically, I bought a new Crockpot and the first recipe I cooked in it today was boneless country spare ribs with sauerkraut, apples, onions, chopped bacon and 1 tbsp of brown sugar. It was delicious. I also eat sauerkraut regularly with kielbasa and because I am of Polish and Hungarian heritage I use sauerkraut in both cuisines which are very similar except the Hungarians add sour cream and paprika to kielbasa or other pork and sauerkraut dishes.
When sauerkraut is cooked in a Crockpot with any recipe it softens up very substantially.
My favorite sauerkrauts:
Saverne Artisanal Kraut with Craft Beer (best of the American sauerkrauts)
Kahne Traditional German Barrel Sauerkraut
Kengstenberg (top seller in Germany)
Thete are some other good ones but I like those as my top 3