Mushroom and Leek Filo Pie

Ingredients

• 70 g butter - 50g of which should be melted
• 2 leeks, trimmed and sliced
• 300 g button mushrooms, quartered
• 1 garlic clove, crushed
• 100 g baby spinach leaves
• 6 eggs, lightly whisked
• 1 /2 cup thickened cream
• 1 /2 cup grated cheddar cheese
• 50 g full-fat fresh ricotta cheese, broken into pieces
• 2 tsp finely grated lemon rind, plus lemon wedges to serve
• 6 sheets filo pastry