Other than cheese. I've tried those too-fancy-for-their-own-good pizzas without cheese and it's just not pizza. Call it flatbread or something else. I get that restaurants likely make them for vegans, but it's still not pizza. But I'm with you, as long as it tastes good, I don't care what's on it or not on it. The only somewhat common topping I refuse to eat is pineapple. Fortunately that's a rare thing here in Chicago, though not as much of a sin as ketchup on a hot dog .