A New York City pizzeria is setting the internet ablaze with its mustard pizza. The Detroit-style eatery uses mustard instead of tomato sauce on one of their pizzas, and tops the creation with corned beef, sauerkraut, and cheese. Naturally, the internet is wildly upset and mildly curious. Pizza toppings are already a polarizing subject. If you thought Twitter was divided by pineapple on pizza, you won’t believe what they have to say about mustard instead of marinara.