Everything is permitted on a pizza. Not even bri'ish but work at a fancy pizza place and have done Beans on Toast pizza and it went over pretty well. White beans, tomato sauce, parm, basil, sprinkled with oregano and drizzled with a very oiled down to make it super super mild and spiced molasses. It went over big even though tbh we were having a contest to see where we'd rotate who make up.the special and the person who tells them what different meal to make a pizza out of. Sometimes it was a goofy challenge other times it turned out to just be a good idea, falafel thin crust pizza slaps, hummus base, falafel balls or crumble, roasted red pepper and pickled red onion, spoon on tabouli after the oven, mind blowing food. We also did a Thai style green curry one that was also really amazing. Anything that has a sauce and a carb can become a good pizza if you put your mind to it and have an industrial kitchen at your disposal. Ooh! This winter I did a garlic oil base, boccocini chunks, this super cinnamon nutmegged date/fig jam I made, roasted garlic and arugula post oven, it tasted like visting grandma for Christmas.