You'll not find 2 pouchers with the same triggers for food irritation. It's kind of like trial and error, and what is bothersome at first, may not be 6 months, 1 year, 6 years, 10 years etc. down the line. I could eat anything at all, with minimal or no issue, for 20 years. 

I would suggest staying away from ginger, tomatoes, anything citrus.  My son also had problems with watermelon.  Also pepper.

its all trial and error.  Good luck!

I am one of those J-pouchers who don't stay away from culprit foods or drinks!  I take precautions before eating/drinking problematic foods.  Usually, all foods and drinks are pouch friendly for me but every now and then the opposite occurs.  So, it is prudent for me to smear on (and a little in) a barrier cream like Calmoseptine before partaking of foods which will cause me pain.  I do realize that once the problematic food/drink is out of me, the burning, etc. will be gone......like magic!  It helps me to know that.  Best wishes!