In a medium bowl, blend flour, sugar, and salt. Cut in cold lard until pea-sized and mealy.
In a measuring cup, whisk cold water, vinegar, and egg. Pour into dry mixture; mix just until shaggy.
Press into a disc (don’t knead). Wrap and refrigerate 30 minutes minimum.
Split in two. On a lightly floured surface, roll each to a 13–14 inch circle. Transfer to pie plate; trim or fold and crimp.
Dock with a fork. For filled pies, proceed with filling. For par-/blind-bake, see below.
Par-bake: Line with parchment and weights; bake at 400°F for 15–20 minutes until lightly golden.
Full blind bake: Remove weights; bake 10–15 minutes more until golden and cooked through. Cool completely before filling.