lemon pie recipe

**Ingredients for the Crust**: - 1 1/2 cups (150 g) graham cracker crumbs or digestive biscuit crumbs - 1/4 cup (50 g) granulated sugar - 6 tablespoons (85 g) unsalted butter, melted **Ingredients for the Filling**: - 1 cup (240 ml) freshly squeezed lemon juice (about 4-5 lemons) - 1 tablespoon lemon zest - 1 can (14 oz/400 g) sweetened condensed milk - 4 large egg yolks **Ingredients for the Meringue Topping (optional)**: - 4 large egg whites - 1/2 cup (100 g) granulated sugar - 1/4 teaspoon cream of tartar - 1/2 teaspoon vanilla extract