Mix flour, salt, and baking powder together in a bowl. Cut in lard until the mixture resembles coarse meal.

Whisk water, egg, and vinegar together in another bowl; add to dry ingredients and stir until dough is thoroughly moistened and forms a ball.

Divide dough into fourths; roll each portion into a ball and flatten into a disk.

If using immediately, roll each disk on a lightly floured surface to fit your pie pan, then bake as directed in your recipe.