Preheat the oven according to the package directions and prepare a baking sheet with baking paper.

Unroll the puff pastry, use a rolling pin to stretch it out if needed.

Spread the pastry with mustard.

Arrange the salami and cheese in layers on one half of the pastry dough. Two layers of each is good.

Fold the other half of the pastry dough over the salami and cheese and use a fork to close the edges.

Bake according to the time directed on the package. For me it was about 30 minutes. I cover the top with a piece of foil for the first half of baking time, then remove it so the pastry will brown.