Warm half of the milk with the sugar lukewarm. Dissolve yeast in it. Put the flour into a mixing bowl and make a depression in the middle. Add the yeast milk and mix with a little flour from the rim. Let the pre-dough rise in a warm place for about 15 minutes.
Warm the remaining milk lukewarm. Add eggs, butter, salt, lemon peel and milk. Work into a smooth dough with the dough hooks of the hand mixer, cover and leave to rise for about 30 minutes. Then roll out on a floured work surface to a thickness of approx. 1 cm and cut out circles with a round cookie cutter (approx. 6.5 cm Ø). Knead dough remains, roll out again and cut out.
Put 1 teaspoon of jam on each circle, press the circle together and form a ball. Place the dough balls on strips of baking paper (approx. 5 cm wide) and let them rise for another 15 minutes.
In the meantime, heat the frying fat in a deep fryer or in a high pot to approx. 180 °C. Fry the dough balls in portions for about 4 minutes until golden brown. Take out, let the fat drip off. Dust with icing sugar. Results in approx. 30 pieces.