Late-Summer Tomato Sauce

Ingredients

• 4 cloves garlic, minced
• 1 cup chopped red onion
• 1/2 cup pitted Kalamata olives
• 1/4 cup drained capers
• 1 teaspoon fresh thyme or 1/2 teaspoon dried
• Pinch of cayenne pepper
• 4 tablespoons extra-virgin olive oil
• 2 pounds local ripe heirloom tomatoes
• 1/2 cup chopped fresh herbs such as parsley, basil, or oregano (optional)