Cut 250 g butter into pieces. Put it in a mixing bowl with 100 g sugar, flour and egg. Knead first with the dough hooks of the hand mixer, then quickly with your hands to a smooth short pastry. Form into a roll (4-5 cm Ø), wrap in foil and chill for approx. 30 minutes. Cut the dough into 3-5 mm thick slices and place them on 2 baking trays lined with baking paper. Bake one after the other in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: stage 2) for 20-25 minutes.
Let them cool down. In the meantime, roast the nuts in a pan without fat and remove. Caramelise 200 g sugar, pour on cream and simmer until the sugar is dissolved. Stir in the nuts and quickly spread them over the biscuits. Allow to set
30 minutes waiting time