Foods don't cause flares....but they can cause discomfort (if not flaring) or exacerbate some symptoms if you are flaring.
If you don't feel good after eating some foods...don't eat them. I can pretty much eat anything, but when I'm flaring I would avoid foods that will cause me discomfort if I'm out and about
for the day.
Eat small amounts of foods that you believe might cause you discomfort....you might be able to tolerate a certain amount, yet more won't agree.