Soak gelatine in cold water. Simmer 250 ml water and sugar in a pot until the sugar is dissolved, remove from heat and allow to cool. Squeeze out the gelatine, dissolve in the still warm sugar water and let it cool down further. Wash, halve and stone the plums. Cut the plums into small pieces and puree them finely with sugar water and lemon juice for about 3 minutes. Beat the egg whites and salt until stiff, carefully fold into the puree, which should be warm to the touch at most. Freeze the sorbet mixture in an ice-cream maker or put it in a flat, freezer-proof mould and freeze for 3-4 hours, stirring frequently
Wait 3-4 hours. Per bullet about 410 kJ, 100 kcal. E 1 g, F 0 g, KH 23 g