It’s the flour, generally. Although rice is now fine. I mean rice has been fine for a few years. It really depends on sect and how observant you are.

I don’t keep kosher nor kosher for passover. I’ll make sure food I prepare for mother for seder is good, but once I get home I’m eating a very normal pizza and pasta cause they’re cheap.

Also kosher for passover cakes are horrific, just make a flourless torte. Or something. Charoset is delicious as a dessert.