Knead flour, fat, sugar, egg and lemon zest with the dough hooks of the hand mixer. Then use your hands to quickly work the dough into a smooth short pastry. Wrap in foil and put in a cool place for about 1 hour.
Roll out the short pastry thinly on a floured work surface and cut out approx. 50 cookies of approx. 5 cm Ø. Make a hole in half of the biscuits with a small cookie cutter (2 cm Ø).
Spread on two baking trays lined with baking paper. Whisk the egg yolk and cream and spread the cookies with it. Bake one after the other in a preheated oven (electric: 175 °C/ gas: level 2) for about 12 minutes.
Let it cool down. Cream egg yolk and sugar and mix with the peanut purée. Spread the peanut cream on the biscuits with a knife, without a hole, and place the short pastry wreaths on top. Makes about 25 pieces.