Wash potatoes thoroughly and cook separately in plenty of salted water for about 15 minutes. Peel, wash and finely dice shallots. Chop half of the olives finely. Mix 4 tablespoons of water, vinegar, sugar, shallots and chopped olives. Fold in the oil. Season with salt and pepper
Washing tomatoes, cleaning. Cut green tomatoes into slices, quarter yellow tomatoes and halve red tomatoes. Put aside
Drain the potatoes, rinse with cold water, peel and slice. Wash basil, shake dry and remove leaves
Mix the potatoes, tomatoes and remaining olives. Arrange on plates and sprinkle with the vinaigrette. Sprinkle with coarse pepper. Add mozzarella balls and garnish with basil