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Dice butter and place in the freezer along with the lard for 30 minutes.
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Place flour, baking powder, and salt in the bowl of a food processor fitted with a knife blade. Pulse a 1 or 2 times to combine.
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Cut frozen lard into small pieces. Add lard and butter to the food processor bowl. Pulse a 5 or 6 times.
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Add 4 tablespoons of the milk. Pulse 4 or 5 times. Remove the cover and check the dough. When it is done it should appear crumbly and will hold together when you press a handful together. Add more milk if needed and pulse.
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Shape dough into a log and wrap in plastic wrap. Chill dough for at least 4 hours or overnight.
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Preheat oven to 450°F. Lightly grease a 4 1/2- X 14-inch tart pan.
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Roll out the dough on a lightly floured surface to a 6 1/2- X 16-inch rectangle. Move the dough around as you are rolling it out to make sure it is not sticking to the work surface.
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Transfer dough to tart pan. Lightly press the dough in place. Roll the pin over the edges to cut off excess dough.
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Prick the bottom of the dough at 1/4-inch intervals with a fork.
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Cut a sheet of aluminum foil 4 inches longer than the tart pan. Lightly butter the shiny side. Turn the foil over (shiny side down) and make a pouch of it. Fill the pouch with a dried beans or pie weights. Line the dough with the foil and press it against the edges. Make sure the beans or pie weights cover the entire bottom and are against the sides.
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Bake the crust for 10 minutes. Remove the foil and beans/weights and prick the bottom again with a fork. Bake a few minutes more until the pastry begins to color and separate from the side of the pan. Cool 10 minutes in the pan then remove it to cool on a rack. Once cooled completely, place the crust back in the tart pan.