Arrange the slices of tomato and cheese on a large platter, alternating them in a decorative pattern.

In a bowl, whisk together the olive oil, vinegar, salt and pepper. Drizzle the dressing over the tomato and mozzarella slices. Cut the fresh basil leaves into thin strips and sprinkle then over the dish. Serve immediately.

(417 calories/serving; GL=2, Glycals=6) If you add canned or grilled tuna (1/4 lb or 115g per person: Calories=700, GL1, Glycals=10)