First you need to have fresh pineapple. Not that fibrous tough stuff that's not quite ripe yet but beautifully ripe perfectly sweet fresh pineapple. Canned pineapple is just trash you throw in a fruitcake.
Next you need a pizza that's going to be spicy. Not a little bit spicy but we're most people will go oh my God it's very spicy. Generally a very spicy pepperoni works along with some additional hot peppers.
Lastly you need to be able to cook it so the sugars in the pineapple gets caramelized without burning the pizza and without burning the cheese. Once you've accomplished these things you have a very awesome sweet and spicy pizza with pineapple on it.
It is oh so rare to be able to find a pizza like this.