In a large mixing bowl, combine the all-purpose flour and salt.

Add the cold, cubed butter to the flour mixture and use a pastry cutter or your fingers to work the butter into the flour until it resembles coarse crumbs.

In a separate bowl, beat the egg and then add it to the flour mixture.

Gradually add cold water, one tablespoon at a time, mixing until the dough comes together.

Knead the dough gently on a lightly floured surface until smooth, about 1-2 minutes.

Wrap the dough in plastic wrap and refrigerate for at least 30 minutes before using.