This pie can be made with many different fruit combinations according to seasonality and personal preferences. Try it with peaches, apricots, plums, cherries, and berries in any combination you like.
3 Tbsp (45 mL) ice water
1 tsp (5 mL) unpasteurized cider vinegar
1 large free-range egg yolk
1/2 cup (125 mL) sweet sorghum flour
1/4 cup (60 mL) each cornstarch, sweet rice flour, and hazelnut flour
1 tsp (5 mL) xanthan gum
1/4 tsp (1 mL) salt
1/2 cup (125 mL) cold unsalted butter, cut into 1 in (2.5 cm) cubes
1 free-range egg
1 tsp (5 mL) water
2 1/2 cups (625 mL) apples, skin on, cored, and sliced
2 1/2 cups (625 mL) pears, skin on, cored, and sliced
1/4 cup (60 mL) hazelnut flour
2 Tbsp (30 mL) maple syrup
2 Tbsp (30 mL) cornstarch
1/4 cup (60 mL) hazelnuts, halved
Mix together ice water, vinegar, and egg yolk; set aside.
In bowl of food processor with steel blade, pulse all dry ingredients until well incorporated. Add butter and pulse until it has formed small pea-sized lumps, from 5 to 10 seconds.
With motor running, add liquid in slow stream. Pulse until dough is holding together, but not yet forming a ball. Remove dough from food processor bowl and form into a ball. Wrap in plastic and flatten to create disc. Refrigerate for at least 1 hour. Take out of refrigerator about 10 minutes before using.
Preheat oven to 425 F (220 C) and flour rimmed baking sheet with gluten-free flour.
Place large piece of parchment paper on work surface and place dough in middle. Cover with second piece of paper and roll out dough to form a 12 in (30 cm) circle. Remove top sheet and flip dough onto baking sheet. Remove paper.
Mix together fruits, hazelnut flour, maple syrup, and cornstarch. Place fruit mixture in centre of dough, up to 2 in (5 cm) from sides. Garnish with hazelnuts. Fold dough over, leaving centre uncovered. Whisk egg with 1 tsp (5 mL) water to create egg wash, and brush over pastry.
Bake for 15 minutes, then lower temperature to 375 F (190 C) and bake for an additional 25 to 30 minutes, until fruits are tender and dough is golden.