Caramelise the sugar in a pan over medium heat until golden. Deglaze with vinegar while stirring, bring to the boil and season with salt and pepper. Simmer at medium heat for 2-3 minutes
In the meantime, wash the tomatoes and drain them well in a sieve. Add the tomatoes to the stock, bring to the boil and simmer for 4-5 minutes until they burst. Drizzle with 1 tablespoon of oil. Remove from the stove
Meanwhile drain the mozzarella and cut it into 8 slices. Wash basil, shake dry, pluck leaves from the stalks and cut coarsely, except for 4 small leaves. Mix 2 tablespoons of oil and basil, turn the mozzarella in it
Spread some tomatoes evenly on 4 small plates, layer them with the mozzarella slices and the remaining tomatoes to form little towers. Garnish with basil leaves, sprinkle with pepper and salt flakes