Leek galette

1. Directions for pie dough:

2. 1. Stir together the flour, butter, and salt to blend. Using a pastry blender or 2 forks, cut the butter into the flour. For pies with liquid fillings (like custard or cooked-fruit fillings that are thickened with cornstarch or tapioca), the bits of fat should be evenly small, and the mixture should resemble a coarse meal. This will result in a mealy piecrust, which is less likely to become soggy as the pie bakes. For pies to be filled with fruit or another non-liquid filling, leave some larger bits of fat, about the size of small walnut pieces, for a crisp and flaky texture in the baked crust.
2. Make a well in the middle of the flour mixture and add the water all at once. Gently toss the mixture together until just blended and the flour is moistened (the mixture will look shaggy and loose).
3. Turn the dough out onto a lightly floured work surface and gently knead it together, combining parts of the mixture that are wetter with those that are drier. If preparing a double-crust recipe, divide the dough in half. Shape the dough into a 1-inch-thick disc, wrap in plastic wrap, and chill until firm, about 20 minutes. NOTE: At this point, the dough is ready to be used. It can be stored, tightly wrapped, in the refrigerator for up to 3 days or in the freezer for up to 2 months.
4. Working with one disk at a time, unwrap the dough, place it on a lightly floured work surface, and scatter a little flour over it. Alternatively, place the dough between sheets of parchment or waxed paper. Roll out the dough for the bottom crust of a pie into an even round, about 13 inches in diameter (for a 9-inch pie pan). It should be about 1/8 inch thick.
5. Fold the dough in half or roll it loosely around the rolling pin, and gently lift and position it over the pan. Unfold or unroll the dough and ease it into the pan without stretching, making sure that the pan sides and the rim are evenly covered. Press the dough gently against the sides and bottom. Trim the overhang to 1 inch.
6. For a single-crust pie, tuck the dough overhang under itself and flute the edges. Fill and bake the pie according to the recipe directions. For a double-crust pie, roll out the second piece of dough into an 11-inch round (for a 9-inch pie pan), and then cut vents in it. Fill and finish the pie according to the recipe directions.

3. Position rack in top third of oven; preheat to 450°F. Heat wine and butter in heavy medium skillet over medium-low heat until butter melts. Add leeks. Cover; cook until leeks are crisp-tender, about 4 minutes. Remove from heat. Mix in marjoram. Reserve 2 teaspoons egg; stir remaining egg into leek mixture. Meanwhile, unroll pie dough on lightly floured baking sheet. Stretch or pull dough to 13 x 10-inch rectangle. Spread leek mixture over dough, leaving 1-inch border on all sides. Sprinkle pepper over filling. Fold 1-inch border in over filling. Brush folded edge with reserved 2 teaspoons egg.
Bake galette until crust is golden brown, about 14 minutes. Cut galette into 4 pieces and serve warm.