Knead the butter in pieces, sugar, 1 pinch of salt and egg yolk with the dough hooks of the mixer. Knead 250 g flour with your hands. Wrap the dough in foil, chill for about 1 hour.
Preheat oven (electric cooker: 180 °C/circulating air: 160 °C/gas: see manufacturer). Line two baking trays with baking paper. Roll out the dough on a lightly floured work surface to a thickness of approx. 7 mm. Cut into rectangles (approx. 2 x 5 cm). Place on the trays and bake in the hot oven for approx. 12 minutes one after the other. Take out and let cool down.
Spread each biscuit with 1 level teaspoon of caramel spread. Coarsely chop the chocolate coating and melt in a hot water bath. Allow the chocolate coating to cool slightly and spread approx. 1 tsp. on each caramel. Sprinkle with a little sea salt. Leave to dry.