Prepare the vegetables. Stem and seed grilled green peppers, then wash and cut flesh into 6 mm/¼ inch dice. Cut tomatoes into 6 mm/¼ inch dice. Add to diced green peppers. Cut onion into 6 mm/¼ inch slices, then cut slices into dice. Add to diced green peppers and tomatoes. Mix well.
Combine olive oil, vinegar and finely chopped garlic. Add salt to taste, and m