1. FOR CRUST: Combine rice flour, tapioca flour, potato starch, salt, cinnamon and xanthan gum in a medium size bowl. 2. Cut in the butter with pastry blender or two forks, until the mixture resembles large crumbs. 3. In a small bowl, whisk together the egg, apple cider vinegar and ice water. 4. Gently stir the egg mixture into the flour, until it forms a ball. 5. On a lightly rice-floured surface, knead the dough for 2-3 minutes. Form into a ball and wrap in plastic wrap. Refrigerate for one hour (or freeze now for later use). 6. After removing from the fridge, knead the dough slightly, if needed. 7. Roll out between two sheets of lightly floured parchment paper (I use an $8 plastic, zippered pie bag from King Arthur Flour) then transfer to 9-inch pie plate. 8. Heat oven to 425°F. 9. FOR FILLING: In large bowl, combine sugar, flour, nutmeg, cinnamon and salt. Add apples and gently stir to coat. Pour into pastry-lined pie plate. 10. FOR TOPPING: In small bowl, combine flour and brown sugar. Cut in butter til mixture is crumbly. Sprinkle over filling. 11. Bake uncovered for 40 minutes, then cover topping with aluminum foil and bake 10 minutes more. ---------------------------------------------------------------------------
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