A square pizza baked on an oven tray might not seem like the real thing, but to any who doubts it, you just tell them it’s called “pizza in teglia” and make an Italian gesture with your hand. Apart from the delicious fluffy dough, the advantage to this variety is it can be prepared in any conventional kitchen. You don’t need any advanced pizza-spinning knowledge or complicated kitchen utensils. Because the dough, which contains a lot of water, is fluffier and thicker, pizza recipe blogger Julia Ma chooses an unusual topping for her tray-baked pizza. “There’s nothing stopping you from putting p…