Preheat the oven to 200°C (392°F) and line a baking tray with baking paper.
Cut the puff pastry into 4 equal pieces.
Spread 1 tablespoon of strawberry jam on each piece.
Place 2 slices or pieces of Le Carré cheese along one edge of each piece.
Sprinkle each piece with 1 tablespoon of chopped walnuts.
Fold each piece over twice to form a roll.
Cut each roll in half, then twist each half from the outside to form spirals.
Place the spirals on the prepared tray and brush with beaten egg yolk.
Bake for 30 minutes, or until puffed and golden.
Let cool for 10 minutes before serving.