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Lightly grease 12 muffin cups. In medium-sized bowl, whisk the flour, salt, and sugar together. Cut the butter and lard into chunks and add to the flour. With a pastry cutter, cut the butter and lard into the flour until the fats resemble the size of large peas.
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In a measuring cup, whisk the egg and vinegar together. Add enough cold water to measure 2/3 cup. Add the egg-vinegar-water mixture to the flour, small amounts at a time, and mix with a fork or hands. Add only enough water that the dough clings together and can be gathered into a ball (it may not take all the liquid).
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Divide the dough in four pieces. Form disk shapes with each piece. Place disks in the refrigerator for about 10-15 minutes to chill. Remove one disk at a time from the refrigerator and break off chunks, about 2 oz in size, which should give ample for 4” circles to be cut for each tart. Place dough between two sheets of parchment paper (or wax paper) lightly dusted with flour. Roll pastry to desired thickness, generally between 1/16”and 1/8” thickness. Peel the top piece of parchment from the rolled out pastry. Cut out pastry circles with a floured 4” round cookie cutter.
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Carefully transfer each cut out pastry circle to muffin tin cup. Fit the pastry into the cup, ensuring there are no air pockets between the pastry and the muffin cups. Repeat with chilled dough to make enough pastry circles for 12 tart shells, gathering up and re-rolling pastry scraps as necessary. Place pan of tart shells in freezer for about 12-15 minutes to chill to prevent shrinkage of pastry during baking.