Roll up the puff pastry. Mix the tuna, sheep cheese and corn well in a bowl. Spread the mixture on the puff pastry and roll up the puff pastry. Brush the roll with egg yolk and press the ends down.
The roll is baked at 200 ° C for about 20 minutes. Before serving, the roll is cut into 2 cm thick slices. If you want, you can also cut the puff pastry into squares and bake small rolls.
They can be served warm or cold. But a colorful salad as an accompaniment is also highly recommended.