Preparation Preheat oven to 200°F. Put tomatoes, cut sides up, in 2 large shallow baking pans. Combine garlic and oil and spoon over tomatoes. Season tomatoes with salt and pepper and roast in oven 6 to 8 hours (tomatoes will be reduced in size but will retain their shape). Cool tomatoes. Cooks' note:Roasted tomatoes keep in an airtight container, chilled, 2 weeks. Bring to room temperature before using.