Zagorski Štrukli with Baked Puff Pastry

Method

1. Preheat oven to 300°F (150°C) for slow baking
2. Roll out puff pastry and cut into 8x8 inch squares
3. Chill pastry in refrigerator for 30 minutes to stabilize
4. Spread tomato sauce on each square
5. Top with shredded mozzarella and sautéed onions
6. Fold pastries into triangles and brush with melted butter
7. Bake for 35-40 minutes until golden and crisp
8. Let rest 10 minutes before serving