Traditional Serbian Burek with Spinach and Cheese

Method

1. Preheat oven to 180°C (350°F).
2. In a pan, sauté the onion until translucent, then add the spinach and cook until wilted. Season with salt and pepper.
3. In a bowl, mix the mozzarella and Parmesan cheese.
4. Layer the phyllo dough in a baking dish, brushing each layer with olive oil.
5. Spread the spinach mixture over the phyllo, then top with the cheese mixture.
6. Fold the phyllo over the filling, then brush with the beaten egg.
7. Bake for 25-30 minutes until golden brown.