In a large bowl, combine the marionberries, sugar, tapioca, and lemon juice. Gently stir together. Allow to rest for 15-20 minutes so the fruit can soften and the tapioca can thicken.
6 cups fresh or frozen marionberries, 1 cup granulated sugar , ¼ cup quick-cooking tapioca, 2 tablespoons fresh lemon juice
On a floured surface, roll out one pie crust into a 12-inch circle. Gently fit into a 9-inch pie plate with the excess dough draped over the sides of the pie plate. Roll out the second crust and cut into 1-inch strips.
1 double-pie crust recipe
Once thickened, pour the fruit filling into the bottom pie shell. Lay the dough strips in a lattice pattern on top.
In a small bowl, beat an egg with 1 tablespoon water for the egg wash. Brush over the lattice top.
1 egg, 1 tablespoon water
Refrigerate the assembled pie for 30 minutes.
Bake at 425°F for 20 minutes. Lower heat to 375°F and bake 30-35 minutes more until golden brown.
Allow pie to cool completely before slicing to allow filling to set.
Notes
Storage: Cover tightly and store at room temperature for 2 days, or in the refrigerator for up to 4. You can also freeze individual slices for up to 4 months. Streusel Topping: Instead of a top crust, mix ½ cup of all-purpose flour with ½ cup brown sugar, ½ cup rolled outs, and 1 teaspoon ground cinnamon. Then cut in 6 tablespoons cold butter with a pastry blender, and spread it on top of the marionberry pie filling.