Pizzas are one of the most beloved foods around. Big enough to share and tasty enough to devour, Americans eat more pizza than any other country on earth. Despite our familiarity with the delicious cheesy dinner, many people aren’t aware of the meaning behind one of the signature aspects of the pizza parlor experience. Pesto? Red pepper flakes? Nope! I’m talking about the little tray in the center! What is it used for, and why is it there?