Preheat oven to 400 F. Fetch a 9-inch pie dish out of the cupboard. (Measure the pie dish across the top of the dish from the inside on one side to the inside on the opposite side.)
Mix flour and salt in a large bowl. With a pastry cutter or cold fingertips, cut butter into the flour until well integrated. Sprinkle cider vinegar over mixture and stir in well with a fork. Add ice-cold water a little bit at a time and blend with a fork until the dough is moist enough to roll into a ball, but not too wet. Roll into one large ball for the pie crust and a smaller ball to use for the leaf cutouts for the edge of the crust.
On a floured cloth or board, roll out pie dough to a circle about 14-15 inches in diameter. Fit the dough circle into a 9-inch pie shell. Line up the edge of the dough with the outer top edge of the pie shell. Trim off any excess dough that hangs over the outer edge.
Roll out the second ball of dough and with a paring knife cut out leaf shapes about 1 1/2-inches by 1/2-inch. Indent a leaf vein pattern using the knife.
Brush the flat top edge of the pie shell with beaten egg white to help the leaves adhere to the top.
In alternating directions, lay leaves over each other all the way around the top edge of the pie shell. Gently press down to keep the leaves in place.
Using a fork, poke holes in the bottom and sides of your crust before baking to prevent it from bubbling up.
Fit a piece of foil or parchment into the bottom of the crust and cover it with baking weights or dried beans. This prevents the empty crust from bubbling up while baking.
Prebake the pie shell for about 7 minutes or until just beginning to firm up a bit. Remove from oven and cool for about 10 minutes before adding pecan pie filling. Bake according to directions in the pecan pie recipe above.