Select and wash the raspberries and currants. Wash and clean strawberries. Stir starch and 6 tablespoons of juice until smooth. Bring the rest of the currant juice, lemon zest and vanillin sugar to the boil. Stir in starch. Simmer at low heat for about 5 minutes.
Add fruit. Let the berry groats cool down a little. Remove lemon peel. Arrange the grits in dessert glasses. Form ice cream into balls with an ice cream scoop and arrange with the groats. Decorate with mint if desired.