Soak gelatine in cold water. Wash the tomatoes. Cut tomatoes and mozzarella into slices. Wash basil, shake dry and remove leaves
Season the stock and vinegar with salt, pepper and sugar. Squeeze the gelatine and dissolve at low heat. First stir some stock into the gelatine, then into the remaining stock
Rinse 4 moulds or cups (each with a capacity of approx. 200 ml) cold. Pour in the stock to a height of approx. 1/2 cm and chill for approx. 15 minutes. Alternately add some basil, each
Place 1 tomato and mozzarella slice on top so that they do not touch the rim of the cup. Cover with the remaining stock and leave to cool for at least 3 hours
Dip the moulds briefly in hot water and turn them over onto plates. Garnish with remaining basil. Wrap Grissini with ham and serve with it