Heat 1/2 inch oil in a large frying pan over medium heat. Add eggplant and saute until browned, about 10 minutes. Remove with a slotted spoon and transfer to a Dutch oven.
Add celery to the frying pan with more oil if necessary. Saute until softened, about 5 minutes; transfer to the Dutch oven.
Cut onion slices into 1-inch pieces. Add to the frying pan with bell peppers and more oil if necessary. Saute until softened, about 5 minutes; transfer to the Dutch oven.
Add tomato paste, vinegar, capers, sugar, and salt to the Dutch oven. Heat over medium heat until simmering, then cook, stirring occasionally, until vegetables are tender, about 20 minutes.
Remove from the heat and allow to cool. Add green and black olives and place in the refrigerator to chill before serving, about 1 hour.
Nutritional Facts
Per 10 servings
Calories: 120
Carbohydrate: 17g
Fat: 6g
Fiber: 6g
Protein: 3g
Sugar: 8g
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