- Preheat oven to 350 degrees F and line a baking sheet with parchment paper.
- Unroll thawed puff pastry and use a rolling pin to roll the dough out so it is slightly thinner and larger in size.
- Place one sheet of dough on the prepared baking sheet and use a sharp knife to score a border 1 inch from the edge of the sheet on all sides.
- Bake sheet for 10-12 minutes or until puffed and golden.
- As pastry bakes, mix together mayo and mustard in a small bowl. Set aside.
- After initial bake, allow pastry to cool slightly, then press down the middle to flatten it.
- Layer the fillings: start with 6 slices mozzarella, then the meats. Spoon mayo mixture over the meat and spread all over. Sprinkle on red peppers, red onion, and arugula.
- Place second sheet of pastry dough on top and use a fork to crimp the edges together.
- Brush top of dough with the beaten eggs.
- Bake for 20-25 or until top is golden brown.
- Serve warm or chilled.
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