Pizza and pizza toppings provoke a lot of fierce debates online.
The great dispute about Hawaiian pizza has never really been settled, and don't even mention anchovies.
Now, a trendy pizza restaurant in New York is making pizza-lovers take sides over a strange new topping: mustard.
The New York pizzeria Lions and Tigers and Squares - which serves up Detroit-style, thick crust square pies - gets credit for bringing attention to this nasty trend.
But it actually has deep roots.
Squares owner Francis Garcia says mustard pizza was invented at a Trenton, New Jersey pizzeria called Papa's Tomato Pies.
Supposedly, a drunk customer misspoke while ordering "mushroom pizza," and the rest is history.
Many brave customers compare the mustard pie to an open-faced sandwich. And in fact, Squares pairs the condiment with corned beef and sauerkraut, before smothering it in brick cheese.
"Mostly everybody when they eat it, they’re like ‘Oh my God this is great.’ Because who the ---- doesn’t like a cheese sandwich with mustard on it?" said Garcia.
What do you think of mustard pizza? Tasty, or terrible?
[H/T: Food Insider]