Knead 250 g flour, 50 g icing sugar, salt, orange peel, fat in pieces and egg first with the dough hooks of the hand mixer and then briefly knead until smooth with your hands. Cover and chill for approx. 1 hour
Finely dice the marzipan. Knead with 50 g icing sugar. Roll out to a rectangle (approx. 28 x 32 cm) on a little icing sugar
Line baking trays with baking paper. Roll out dough on a little flour to a rectangle (approx. 28 x 32 cm). Spread with marmalade, place marzipan rectangle on top. Cut in half lengthwise. Roll up both sheets firmly from the long side
Cut the rolls into approx. 25 slices each. Place them on the trays, press them flat if necessary. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for approx. 14 minutes. Let them cool down
Wash orange hot, rub dry. Peel the peel with a julienne shredder in fine strips, squeeze the juice. Mix 100 g icing sugar and 2 tablespoons orange juice. Spread the cookies thinly with it and sprinkle with orange peel. Leave to dry