Actually, you can use them for pot pies and mincemeat pies, too. It's actually pretty easy, just cut the pie crust into strips and weave them like a blanket. The link below has some great pictures.
1 Before starting the lattice top, roll out half of your pie dough and line your pie dish with it. The dough should extend beyond the rim of the pie dish by about half an inch. Put it in the refrigerator to chill while you work on the lattice.
On a lightly floured surface, roll out the other half of your pie dough to the same extent as the first half (about 3 inches beyond the diameter of your pie dish). It's easier to work with the dough if it is chilled, so if it the dough has softened too much, put the rolled-out piece on a flat cookie sheet and chill it in the refrigerator or freezer for a few minutes. 2 Cut the dough into even strips, 1/2-inch to 3/4-inch wide, depending on how thick you want your lattice strips.
You can use a blunt knife with or without a ruler or straight edge to guide you, or you can use a pizza wheel or a pastry wheel if you have one. 3 Fill your pie shell with the pie filling. Lay out 4 to 7 parallel strips of the pie dough, depending on how thick your strips are, on top of the filling, with about 1/2-inch to 3/4-inch space between them.
Fold back every other strip. 4 Place one long strip of dough perpendicular to the parallel strips as shown.
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