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Preheat the oven to 200°C (400°F).
Roll out the puff pastry sheets on a lightly floured surface.
Spread the mustard evenly on the surface of each sheet of puff pastry.
Sprinkle the grated mozzarella cheese over the mustard layer.
Roll the puff pastry sheets tightly and cut them into 1-inch wide pieces.
Place the pieces on a baking sheet lined with parchment paper.
Bake for about 12-15 minutes, or until golden and crispy.
Let the appetizer cool slightly before serving.
Serving and Storage Tips:
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