Put the flour in a bowl. Mix the egg yolk with water and salt and add it to the flour in a bowl together with oil, sugar and liquid butter. Mix briefly and work into a smooth dough on the work surface. Wrap in cling film and let rest at room temperature for about 15 minutes.
Peel and core the apples and cut them into small cubes. Add sugar, vanilla sugar, sultanas, breadcrumbs, cinnamon, rum and lemon peel, mix well and leave to stand for a few minutes.
Halve the fritters dough, press it a little flat, dust with flour and roll it out thinly with the pasta machine (you can also run it through the machine more often). Put small heaps of the apple filling on half of the pastry sheet. Now brush the edge of the pastry sheet with egg white. Fold the dough-sheets together, press the edges with your hands and roll off the fritters with the dough wheel and put them on a cloth. Heat the baking fat to 190 degrees and bake the fritters on one side until crispy brown, then turn them over with a brook shovel and finish baking on the second side.
Drain the fat on a kitchen paper and serve.
Baking temperature: 190 degrees
Baking time: about 3 minutes