1 medium eggplant, peeled
2 red bell peppers, seeded
1 red onion, peeled
2 garlic cloves, minced
3 tablespoons good olive oil
1 ½ teaspoons kosher salt
½ teaspoon freshly ground black pepper
1 tablespoon tomato paste
2 tablespoons red wine vinegar
Preheat the oven to 400 degrees.
Cut the eggplant, bell pepper, and onion into 1-inch cubes. Toss them in a large bowl with the garlic, olive oil, salt and pepper. Spread them on a baking sheet. Roast for 45 minutes, until the vegetables are lightly browned and soft, tossing once during cooking. Cool slightly.
Place the vegetables in a food processor fitted with a steel blade, add the tomato paste and vinegar, and pulse 3 or 4 times to blend. Add salt and pepper to taste.