A perforated pie tin
is an advantage in the baking of shells or single-crust pies, for it prevents
the air from becoming confined between the pan and the crust and producing
air spaces that would cause blisters to form as the pie is baked. If desired,
the crust may be placed over the back of the pan and baked, thus forming
a shell that may be filled with a cooked filling and served.
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