Add ricotta, Parmesan, shredded mozzarella and a pinch or two of red pepper flakes. Taste, and add salt if it seems underseasoned. Make sauce: In a deep skillet, heat butter until melted.
Crushed red pepper flakes - Perhaps even more ubiquitous than ... Perhaps most famously used to make kimchi and gochujang, lending its fiery red color, it can add wonderfully complex flavor ...