Easy filo topped pie

Ingredients

• 500 gram lamb mince
• 1 onion, peeled and chopped
• 3 clove garlic, crushed
• 1 cup fresh, sliced mushrooms
• 1 carrot, peeled and finely chopped
• 2 stalks celery, finely chopped
• 1 tablespoon fresh rosemary, chopped
• 2 tablespoon Italian herbs blend
• 1 tablespoon plain flour
• 1 3/4 cup Campbell's Real Beef Stock
• 400 gram passata
• 8 sheets filo pastry
• 25 gram melted butter