I use back pepper for the hot taste you might get from hot peppers. Cauliflower can do many things a potato can from mash to potato salad. Sweet potato makes a great baked potato or fries. Other root veges can sub for potato in soups. Tomato is the one thing I don't have a sub for so I just leave It out or find another recipe. Tomato sauces, ketchup and BBQ sauces are out. Read your ingredients. Anything that says added spices usually contains peppers and modified food starch is potato starch. Best to eat only what you have made for a week or two to make sure you have eliminated all night shades for sure to see if you feel better. In the beginning, I could not even handle potatoes without feeling it the next day. Almost 3 yrs later, I have found that I can make them for my family ( I still won't eat them), so maybe I have healed a bit and have less reaction.
Originally Posted by Húrin