Creamy lemon meringue pie

Ingredients

• 1 cup graham cracker crumbs
• 6 tablespoons melted butter
• 1 tablespoon sugar
• 1/2 cup lemon juice
• 1 (14 ounce) can sweetened condensed milk
• 2 eggs yolks
• 4 egg whites, room temperature
• 1/2 teaspoon cream of tartar
• 4 tablespoons white sugar