Eat a perfect peach under the summer sun and you'll experience the fruit at its messy, dripping, sugar-bright best. Rinse your chin and understand that no melon, apricot or blackberry can compete. But how often does this happen? For most of us, a great and truly perfect peach is a rare event. We can expect but one or two a season, for all our trying. Enter the pie. A peach pie can elevate good peaches to excellence and great ones to the sublime. Even a peach pie made with frozen fruit is a terrific thing. The addition of sugar helps; so, too, do a dash of lemon juice and a light sprinkle of nutmeg, which offers a slight bitterness to offset the sweet. Add a crown of vanilla ice cream for a perfect diner-style à la mode effect.
03Turn the dough out onto a lightly floured surface, and gather together into a rough ball. Divide the ball in half with a knife or a pastry scraper, then divide each portion in half again, and again, to create 8 portions. Using the heel of your hand, flatten each portion of dough once or twice to expand the pebbles of butter, then gather the dough together again in one ball. Divide this ball in half.
04Flatten each ball into a 5- or 6-inch disc, one slightly larger than the other. Wrap the discs in plastic wrap, and place in the refrigerator for at least 60 minutes.
05Preheat oven to 425. Make the pie filling: Combine sliced peaches, lemon juice, sugar and flour in a large bowl, and gently mix to combine. Set aside.
06Take the larger of the pastry discs out of the refrigerator, roll it out on a lightly floured surface and place in a 9-inch pie plate. Add the peaches. Sprinkle them with the ground nutmeg.
07Roll out second disc of pastry. Place on top of filling. Wet edges of the bottom pastry disc with some cold water. Trim pastry, pinch bottom and top edges together and cut a few slits to allow steam to escape from the pie. Brush the egg white on the top, particularly around the edges, and sprinkle with a pinch of granulated sugar.
08Bake the pie for 15 minutes, then reduce heat to 375. Cook until peaches bubble and pastry is golden, approximately 45 minutes to an hour.