Preheat your oven to 200°C / 400°F and line a baking tray. This step matters because a hot oven helps the pastry puff quickly and evenly, creating that golden crust everyone loves.

Roll out the pastry slightly, then cut it into narrow strips. Spread a thin layer of mustard on each strip. This adds flavor without making the dough soggy, which is key for a good texture.

Wrap each sausage with a strip of pastry, overlapping slightly. Place them seam-side down on the tray. This keeps them from unrolling while baking and helps them brown evenly.

Brush each piece with beaten egg and sprinkle lightly with salt. Bake for 15–20 minutes until puffed and golden. Let them rest briefly before serving, as the filling will be very hot.