Wash the currants, pluck them from the panicles and drain well. Wash the cherries and stone them. Wash blueberries and drain. Boil up sour cherry nectar, 75 g sugar, cherries and currants.
Cover and simmer for about 4 minutes. In the meantime stir the starch and 4 tbsp. water until smooth. Stir the mixed starch into the boiling fruits and bring to the boil again. Simmer for 1 minute while stirring.
Stir in blueberries. Remove from the heat and allow to cool while stirring several times. Melt the butter and let it cool down a little. Mix flour, 15 g sugar, baking powder and salt in a bowl.
Whisk buttermilk and eggs. Stir into the flour mixture and mix to a thin dough. Stir in liquid fat. Preheat waffle iron, brush thinly with oil and bake 6 waffles one after the other until golden brown.
Sit on a grid. Separate hearts. Dust the waffle hearts with icing sugar and arrange them on plates with some groats. Decorate with currants. Add the rest of the grits.