Gluten-Free Apple Pie

Ingredients (19)

• 1/2 cup white rice flour
• 1/2 cup brown rice flour
• 1/2 cup tapioca flour
• 1/2 cup potato starch
• 1/4 teaspoon salt
• 6 tablespoons cold butter, cubed
• 1 large egg, lightly beaten
• 1 tablespoon cider vinegar
• 3 to 4 tablespoons ice water
• FILLING:
• 7 cups thinly sliced peeled apples
• 2 tablespoons lemon juice
• 1 cup sugar
• 1/4 cup cornstarch
• 1 teaspoon ground cinnamon
• 1/4 teaspoon ground nutmeg
• 2 tablespoons butter
• 1 large egg yolk
• 1 tablespoon water