Preheat the oven to 250°F. Line a rimmed baking sheet pan with foil.
In a large bowl, toss the tomatoes with the oil, garlic, basil, rosemary, sugar and salt. Place the tomatoes cut-side up on the prepared pan, and bake for 3 hours or until the tomatoes have collapsed and their skins have wrinkled.
Serve at room temperature or chilled.
Recipe Notes
Per serving: 148 calories, 8 g total fat (13 percent saturated), 4 g protein, 19 g carbohydrate, 5.4 g fibre, 0 mg cholesterol, 468 mg sodium