In 10-inch skillet sprayed with olive spray, heat and add onions and sauté until soft but not browned. Add bell pepper and garlic and sauté for 5 minutes. Add eggplant, garlic, tomatoes. Bring to boil while stirring. Reduce heat to low, cover and cook for about an hour (add water or broth if it gets dry), stirring occasionally. Remove cover and cook until mixture is thick. Stir in lemon juice and season with salt and pepper to taste.