Defrost puff pastry at room temperature for about 20 minutes. Whisk egg yolk and cream. Cut puff pastry into 1 cm wide strips. Cover half of the puff pastry strips with a slice of breakfast bacon each and turn them inside out. Turn the rest of the puff pastry strips and spread with pesto. Put the puff pastry sticks on a baking tray lined with baking paper and brush them with the whisked egg yolk. Bake in a preheated oven (electric cooker: 200°C/ gas: level 3) for about 15 minutes