1. Cut the eggplants and peppers into small cubes.
2. Sauté them in 3 tablespoons of oil for 15 minutes.
3. In another pot, heat the remaining oil. Add the minced onions. Once they are golden, add the can of peeled and crushed tomatoes. Let it simmer for 10 minutes, then add the capers, pitted olives, raisins, and finely minced celery stalk. Mix well, then add the eggplants and peppers.
4. Pour in the vinegar and water. Season with salt, pepper, and sugar.
5. Cook uncovered for 15 minutes to allow the vinegar to evaporate and the mixture to slightly thicken.
6. Serve cold.