Place tomatoes, cucumber, peppers, onion and parsley in a large bowl and toss.
Place oil, vinegar, salt and pepper to taste in a screw-top jar. cover and shake until well blended.
Toss dressing with vegetables, turn into a serving bowl and refrigerate until ready to serve. Top with crumbled cheese and portion on chilled plates.
4 tomatoes, chopped
1 large cucumer, unpeeled and chopped
4 green or red peppers, roasted or raw, chopped
1 large yellow onion, chopped, or 6 green onions, sliced
2 tablespoons chopped fresh parsley
1/2 cup sunflower oil
1/4 cup red-wine vinegar
Salt and black pepper