Attach the puff pastry sheets by pressing with your fingers on the junctures. You need to create a “long single sheet” of pastry, like in the photos.

Spread some Nutella all over the pastry sheet and top with the toasted and crushed hazelnuts.

Roll the sheet from both short sides towards the centre, to obtain something similar to a double Swiss roll.

Slice 2.5 cm – 1 inch slices and put them on a tray covered with baking paper.

Bake in a pre-heated oven at 200°C – 390°F for 15 to 20 minutes, or until puffed and golden brown.

Serve warm or at room temperature.