Mix the flour and salt in a large bowl.
Cut the lard into 1/2 inch cubes and add to the flour.
With a pastry blender, cut the lard into the flour until it resembles very course crumbs.
In a measuring cup, whisk the egg with the vinegar, then add enough cold water to make 1 cup of liquid.
With a fork, gently mix the liquid into the dry ingredients, just until it starts to bind together. If the mixture is too dry, and not coming together, add water 1 tbsp at a time until it does.
Turn the dough out onto the counter and gently bring it together with your hands.
Press it into a round, then cut into 6 equal portions.
Wrap each portion in plastic wrap and chill for at least 20 mintues before using. At this point you can also freeze the dough for use later.
After the dough has chilled, prepare and bake your pastry according to your recipe directions.