“I have an Ashkenaz friend who does the same as you (i.e./he eats corn on the cob, string beans, and peanuts on Pesach).”
I don’t understand–even if you hold that corn and peanuts aren’t kitniyos, and even if you hold that you can eat kitniyos raw (like you can eat wheat etc. raw), how can he eat cooked string beans? Isn’t that the most fundamentally problematic way to consume kitniyos–that if one ate wheat etc. the exact same way he’d be chayav kares?