Wash and clean the tomatoes, cut them into thin slices and place them on 4 ovenproof plates. Sprinkle each plate with 1 tablespoon of vinegar and season with salt and pepper. Quarter cheese triangles, divide into small pieces and spread on the tomato slices.
Bake for approx. 5 minutes under the preheated grill. Wash the basil, remove the leaves and garnish the tomato slices with it.