Step 1 Place the tomatoes in the bowl of a food processor or a blender and add the basil, oregano, garlic, olives and pepper. Pulse the sauce until thoroughly combined and smooth. Taste the sauce and season as needed (canned tomatoes will vary widely with sodium content, resulting in some sauces that require less salt than others). Remove the sauce to a bowl, lightly cover with plastic wrap and refrigerate until needed. This makes about 3 cups tomato sauce.