Unroll the rectangular puff pastry and spread the entire block of Boursin cheese evenly over it.
Layer the slices of ham evenly over the cheese, then cover them with the slices of emmental cheese.
Roll the pastry up tightly to enclose the filling.
Brush the top of the pastry roll with the egg yolk and sprinkle generously with white and black sesame seeds.
Use a pair of scissors to make deep cuts along the top of the roll.
Bake in the oven at 180°C (350°F) for 30 minutes until golden brown and flaky.
Cook it hands-free.
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