Serbian Börek Recipe with Ground Beef and Phyllo

Ingredients

• 1 tbsp olive oil
• 1 medium yellow onion , peeled and chopped
• 1 lb (454 g) ground beef
• 1 tsp allspice
• 2 tsp hungarian paprika
• salt and freshly ground black pepper
• 1 box phyllo pastry sheet (12 inches x 17 inches)
• 0.75 cup melted butter