To make the piecrust, blend together the flour and salt. Stir egg with fork in a measuring cup. Add water to fill measuring cup to 1 cup. Then slowly incorporate the egg mixture into the flour mixture with a fork, just until a dough is formed. Make 6 balls of crust. Use immediately or store in baggies up to 1 week or freeze.
Preheat oven to 450 degrees F.
Toss peaches and nectarines with lemon juice. Mix in the dry ingredients. Put mixture in pastry shell, dot with butter. Bake for 40 to 45 minutes.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.