Drain the cherries and collect the juice. Boil up the cherry juice, lemon peel, sugar, vanillin sugar and cinnamon stick. Stir cornflour and 4-5 tablespoons of cold water until smooth.
Add to the cherry juice, bring to the boil again and add the cherries. Remove cinnamon and lemon peel. Peel and wash the potatoes and grate them finely on a kitchen grater. Mix with 50 g hazelnut flakes, eggs, salt and flour.
Heat the oil in portions in a frying pan. Bake small crispy buffers from the dough one after the other. Arrange on plates and add 1 blob of sour cream to each. Add some compote and the remaining hazelnuts.
Other compote extra is enough.