Fool Proof Pie Crust

Folks-
It's been a while since I've updated the site with a new recipe, and that's because I use the site as my own personal recipe card file. If I haven't needed an old recipe, have been experimenting much in the kitchen, and haven't found a new recipe that I need to add to the old card file, then I don't update.
Well, one of Zhenie's old high-school friends (she went to school in The Philippines, so how did one of her old friends end up living only a mile away?) dropped off a whole bunch of pairs at our house. I was thinking pie, but didn't find my mom's old pie crust recipe online. Time to fix that.
Here's a recipe that my mom got from one of the cooks at the school she retired from:

Fool Proof Pie Crust
4 Cups Flour
1 Tablespoon Sugar
2 Teaspoons Salt
1 ¾ Cups *Shortening
½ Cup Cold Water
1 Tablespoon Vinegar
1 Large Egg

In a large bowl, mix together the flour, sugar, and salt. Cut in the shortening just until mixed in. In a separate bowl, mix together the water, vinegar, and egg. Add liquid ingredients into the dry ingredients just until a kneadable dough forms. Roll out on a floured surface to about 1/8 inch thick. If making an uncooked pie, be sure to poke the bottom of the pie crust multiple times with a fork before cooking to prevent bubbles.
*Shortening is getting harder to find these days. I intend to experiment with a cocoanut oil soon as a replacement. If I do, I'll let you know the results.