To prepare crust, place flour, sugar, and salt into food processor (or large bowl). Pulse to mix well. Add cold butter in small pieces. Pulse or combine with a pastry blender until mixture looks like coarse meal (or pieces about the sizes of peas). Add ice water, 1 tablespoon at a time, and pulse (or stir with a fork) until mixture forms a ball. Remove dough, and shape into two discs, one slightly larger than the other. Set back in the bowl and cover with a damp towel. Chill.
While dough is chilling, preheat oven to 400°F and prepare filling.
Pick through blueberries, removing any stems and green berries. Combine berries with sugar, cornstarch, lemon juice, and salt. Mix well.
Working on a floured board, roll out larger dough disc to a 11-inch circle. Set into pie plate and fill with berry mixture. Roll out smaller dough disc to a 10-inch circle and cut into strips. Weave strips over berries and crimp edges, sealing together.
Place pie on a baking sheet to catch juices that may run over. Bake pie 45-55 minutes or until juices are bubbly and crust is browned. Remove from oven and let stand at least 10 minutes before cutting.