Quattro formaggi (“four cheeses” in Italian) is a cheese blend used in pasta sauces and as a pizza topping, combining four complementary Italian cheeses for a balance of flavors and textures. The classic combination includes gorgonzola (a tangy, pungent blue cheese), fontina (a mild, semi-soft, nutty cow’s milk cheese), Parmesan (a hard, aged, umami-rich cheese), and mozzarella (a soft, mild, fresh cheese), though the exact cheeses used vary by cook and region. As a pizza topping, the blend is spread over the dough, sometimes with a drizzle of olive oil or fresh herbs, and baked until melted and bubbly; as a pasta sauce, it is melted into a creamy coating, often with garlic, white wine, or cream added. The combination is popular throughout Italy and internationally.