Preheat oven to 375 degrees F. In a saucepan, melt butter. Add onions and mushrooms, and cook, covered, for about 5 minutes. Add parsley, chives and basil, and cook for another 3 minutes. Add rice and eggs, stirring well. Pour into one of the pie crusts and top with the other crust. Bake 45 minutes.
Place the flour and salt in a mixing bowl. Add the shortening and cut with a pastry blender, or use your hands. Add the water, a tablespoon at a time, kneading until the dough is smooth. Roll out the dough to fit a 9-inch pie pan.