Roll the puff pastry open and spread with the horseradish paste.
Cover with smoked salmon and Brugge Young.
Roll up from the short side to the middle. Now also roll the other side up to the middle. Press the two rolled parts together. Cut into strips of +/- 1 cm thick. Place on a baking tray covered with baking paper.
Place in the oven and bake for 15 minutes until golden brown.