Bring 450 ml of water and sugar to a short boil while stirring. Leave to cool. Halve lemons, squeeze juice and measure 100 ml juice. Mix sugar water, prosecco and lemon juice and let cool down
Beat the egg whites in a bowl, then stir into the sorbet mixture. Freeze the sorbet mixture in the ice-cream maker until thick and creamy. Pour the sorbet into a bowl and place in the freezer for about 3 hours
Raspberries selected. Puree the raspberries and icing sugar, pass through a sieve. Use a large ice-cream scoop to cut out balls from the sorbet, arrange each ball in a chilled bowl and decorate with lemon balm and raspberry puree
waiting time approx. 4 hours