The term describes the characteristic spotting pattern found on the underside of Neapolitan-style pizza crust after baking in a very hot oven. These dark, irregular spots, resembling the coat of a leopard, are the result of rapid caramelization and charring of the dough. This visual indicator signifies a desirable combination of high heat, proper dough hydration, and skillful baking technique.
This spotting is not merely aesthetic; it is a sign of complex flavor development and desirable texture. The charred spots contribute a subtle bitterness and smoky aroma that complements the other flavors of the pizza. Furthermore, the intense heat needed to achieve this effect creates a crust that is crisp on the outside and soft and airy on the inside. Historically, it represents adherence to traditional Neapolitan pizza-making methods.