Pasta al Forno con le Olive Nere e Capperi

• 1 large onion, sliced into thin rings
• ⅜ cup/6 tablespoons/85 ml

Set a large pot of cold water to boil. After slicing the onion, heat the oil in a saucepan and then add the onion. Sauté until the onion slices are translucent and fragrant and then add the tomatoes, salt, pepper, basil, and olive pieces. Cook over relatively high heat for about 10 minutes, gently breaking up the tomatoes with a fork or wooden spoon. The sauce should not rapidly boil, but shoul