What is your most controversial pizza topping?

Chili.  Just put leftover chili on a pizza crust, cover it in mozz and cheddar, and add a dollop of sour cream to your plate.  My wife and I have been making this with our leftover chili for the past 10 years.  It helps that chili is one of my favorite foods.

Kimchi or sauerkraut. Live stuff put on after the pizza has been cooked just before cutting. Usually some hot sauce too.

Riona Abhainn wrote:Lamb sausage on a Mediteranean pizza, sounds odd but tastes better than I ever thought it would.

thinly sliced apples, back when we used to have the apple festival at the local nursery each autumn one year they had this tasty pizza with apple, and it was good, sweet balsamic base and some sort of cheese, I'd love to find that again.

I am most definitely trying lamb and artichokes on a neutral white sauce pizza (or maybe a thicker avogolememo sauce) on the next round of Pizza trials at my house. And I'm not opposed to an Apple Pizza on a theoretical level but I think it's a stretch to use a pizza dough base for a desserty thing that would clearly be better on a sweet dough base, regardless of the cheese used.

But I'm here to complain about pizza people who color outside the lines of good taste. And for me, that's Japan pizza dressed with mayonnaise. Mayonnaise! Which is still debated world-wide by the condiment kings regarding its status as a condiment. And, let's not even get into "Japanese" mayonnaise, which is sweeter and softer than Western mayonnaise. It's just gross -- and just, NO.

To add insult to injury, the so-called condiment is applied liberally to, ah (the squeamish should look away now) squid pizza. Yet another abomination.

Clearly, some cultural culinary issues are simply not translatable.