Mix flour, 50 g sugar, 1 pinch of salt, eggs, mineral water and milk. Heat butter in portions in a frying pan. Add 1/4 of the mixture, allow to set and fry on both sides until golden brown.
Bake another 3 pancakes in the same way. Let the finished pancakes cool down. In the meantime, wash the lemon hot and grate it dry. Tear off the zest of 1 half of the pancakes and grate the other half finely.
Mix quark, 75 g sugar, vanillin sugar and grated lemon peel. Coarsely chop the biscuits and fold in, except for approx. 1 tbsp. Spread the cream over the pancakes. Roll up the pancakes, cut them in half and arrange them.
Crumble the remaining biscuits over it. Decorate with lemon zests and balm.