Bring milk, salt, sugar, butter and lemon zest to the boil in a saucepan. Remove from the heat, add flour all at once and stir in immediately with a wooden spoon. Heat and stir until the dough separates from the bottom of the pot as a lump and a white layer forms on the bottom of the pot. Pour into a bowl and allow to cool for 10 minutes. Stir in the eggs one after the other until the dough is shiny and falls off the spoon with a hard tear. Cut out squares (approx. 10 x 10 cm) from baking paper. Pour the dough into a piping bag with a star-shaped spout.
Spray circles (approx. 8 cm Ø) onto the baking paper. Pour the dough in portions with the upper half facing down into the hot frying fat (approx. 180 °C). Loosen the baking parchment while doing so. Turn once and bake for 3-4 minutes until golden brown. Take out with a skimmer and drain on kitchen paper. Dust with icing sugar