ghee’s old-fashioned apple pie

Ingredients

• 1 – deep dish pie crust, baked (to save time, use frozen pie crust)
• 1 large egg white
• 1/2 cup walnuts, chopped
• 1/2 cup plain flour
• 1/2 cup light brown sugar, packed
• 4 tablespoons melted butter
• 1/4 cup sugar
• 2 tablespoons corn starch
• 1 teaspoon cinnamon
• 3 pounds Gala apples
• 1 tablespoon lemon juice