Grind the pine nuts. Knead butter in flakes, sugar, salt, 50 g whipped cream, flour, baking powder, pine nuts and egg to a smooth dough. Wrap in foil and chill for about 30 minutes. Roll out to a rectangle (40 x 18 cm) on a lightly floured work surface. Cut into strips (1.5 x 18 cm) using a ruler. Tie each strip into a knot. Distribute them on a baking tray lined with baking paper.
Whisk the egg yolk and 2 tablespoons of cream. Coat the biscuits with it. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 12 minutes. Remove and let cool on a cake rack. Grind the Amaretti finely. Mix icing sugar and liqueur. Spread the pastry with the icing sugar and sprinkle with Amaretti