Preheat your oven to 400°F (200°C).

2. Cook the Filling:

Heat olive oil in a skillet over medium heat.

Add chopped onion and garlic, sauté until soft (about 3 minutes).

Add ground beef, breaking it up with a spoon, and cook until browned.

Stir in tomato paste, breadcrumbs, and Parmesan cheese. Season with salt and pepper.

Remove from heat and let cool slightly.

3. Assemble the Rolls:

Roll out puff pastry on a lightly floured surface.

Spread the beef mixture evenly over the pastry, leaving a small border around the edges.

Sprinkle mozzarella cheese on top.

Roll the pastry tightly into a log, pinching the ends to seal.

4. Bake:

Place the rolled pastry seam-side down on a parchment-lined baking sheet.

Brush with beaten egg for a golden finish.

Bake 25–30 minutes, until the pastry is puffed and golden.

5. Serve: