Mix apricot jam and hazelnuts (2 tablespoons retained). Remove the fresh pastry from the tin and divide into individual triangles. Spread with the apricot-nut mixture and roll up loosely from the broad side. Place on a baking tray lined with baking paper.
Whisk the egg yolk and cream. Spread the croissants with it and sprinkle with the remaining hazelnuts. Bake in a preheated oven (electric: 200 °C/ gas: level 3) for 12-15 minutes. Results in 12 pieces