Preparation

Preheat oven to 425 degrees F (220 degrees C). Place blueberries, nectarines and huckleberries into a colander to drain off any excess liquid. To Make Dough: In a medium bowl, combine flour and salt. Cut 3/4 cup of butter into flour mixture until it resembles coarse crumbs. Pour in one tablespoon of water at a time until the dough sticks together. Add additional water if necessary. Divide dough into two parts. Roll out one half to a circle 1/8 of an inch thick, then place in a 9 inch pie pan. Roll out the other half of the dough and cut into long strips about 1/2 inch wide. Set aside. To Make Filling: Place the drained fruit mixture into a medium bowl, Stir in the sugar, cinnamon, cornstarch and flour; pour into the prepared pie pan. Dot with the remaining two tablespoons of butter. Arrange the pastry strips into a lattice top and crimp edges. In a small bowl, whisk together the egg yolk and teaspoon of water, and use a pastry brush to coat just the lattice strips–not the edges. Bake in the preheated oven and bake for 25 minutes, until the crust begins to brown. Reduce the heat to 350 degrees F (175 degrees C) and bake for an additional 20 to 25 minutes. Remove from oven and let cool a bit before serving.