Preheat the oven to 450°F (232°C) and cover a rimmed baking sheet with foil.
Combine the tomatoes, garlic, olive oil, vinegar, salt, pepper, brown sugar, oregano, and chili pepper flakes in a large bowl. Toss to coat, then transfer to the lined pan. Roast for 25 minutes, then set aside to cool for 10 minutes.
Transfer the tomatoes to a cutting board and give them a rough chop. Place the tomatoes in a large serving bowl and fold in the chopped olives.
Notes
Makes about 2 cups.Store the Olive and Tomato Tapenade leftovers in an airtight container in the refrigerator; it will stay fresh for up to 5 days. Freezing is not recommended as it may significantly alter the texture of the tomatoes and olives.