Roasted Tomato Sauce

• Red bell peppers (capsicums), 2, seeded and quartered
• Yellow onions, 2, cut into wedges
• Plum

Preheat the oven to 450°F(230°C). Place the peppers, onions, tomatoes, and garlic on 2 rimmed baking sheets. Toss the vegetables with the oil, season with salt and pepper, and spread in an even layer. Roast