Ingredients
1
cup white rice flour
1/2
cup tapioca flour
1/4
cup potato starch flour
1/2
cup cornmeal
2
tablespoons sugar
1
teaspoon xanthan gum
1/2
teaspoon salt
1/4
teaspoon pumpkin pie spice
1/2
cup very cold butter, cut into 1/2-inch pieces
1/4
cup very cold shortening, cut into 1/2-inch pieces
1/4
cup ice water
5
cups fresh blueberries (about 1 1/2 lb)
1/2
cup sugar
1/3
cup cornstarch
1
jar (12 oz) gluten-free blueberry preserves
1/4
cup butter, cut into small pieces
1
teaspoon grated lemon peel
1
tablespoon fresh lemon juice
1/8
teaspoon salt
1
egg, separated
1
tablespoon milk
1
tablespoon sugar
Preparation
In food processor, place flours, cornmeal, 2 tablespoons sugar, the xanthan gum, 1/2 teaspoon salt and the pumpkin pie spice. Cover; pulse, using quick on-and-off motions, until blended. Add 1/2 cup butter and the shortening. Cover; pulse until coarse crumbs form, about 5 seconds. Add water; pulse just until dough comes together. Divide dough in half; flatten each into a disk. Wrap in plastic wrap; refrigerate until firm.
In large bowl, toss blueberries, 1/2 cup sugar, the cornstarch, preserves, 1/4 cup butter, lemon peel, lemon juice and 1/8 teaspoon salt; set aside.
Line cookie sheet with foil; place on lower oven rack to catch any drips. Heat oven to 375°F. Unwrap 1 dough disk (keep remaining dough refrigerated until ready to use). Between 2 sheets of cooking parchment paper generously sprinkled with rice flour, roll dough into 12-inch round about 1/4 inch thick. Carefully peel off top piece of parchment paper; replace paper and turn round over. Peel off parchment paper from second side of dough and discard.
Place upside-down 9-inch glass pie plate on dough round. Turn plate with dough over; remove parchment paper and discard. Pat dough into plate, pressing together any cracks or tears. In small bowl, beat egg white. Brush over dough. Spoon filling into crust-lined plate.
Unwrap second dough disk. Between 2 sheets of cooking parchment paper generously sprinkled with rice flour, roll dough into 12-inch round about 1/4 inch thick. Carefully peel off top piece of parchment paper; invert dough onto filling. Peel off parchment paper from second side of dough and discard. Using sharp knife, trim crusts even with edge of plate; crimp edge with fork to seal. Cut vents in top crust. In small bowl, beat egg yolk and milk. Brush over dough. Sprinkle with 1 tablespoon sugar.
Bake 1 hour to 1 hour 10 minutes or until crust is golden and filling is bubbly. Cool completely on cooling rack, about 2 hours.
