Blend
flour, sugar and salt in processor. Add butter, using on/off turns; process
until coarse meal forms. Add 8 tablespoons ice water and cider vinegar; blend
until moist clumps form, adding more ice water by teaspoonfuls if dough is
dry. Gather dough together. Turn dough onto work surface and flatten into
disk. Chill at least 1 hour. Roll the pastry into a rectangle, 12 by 12 inches.
Cut into 4 (6-inch squares) with pastry cutter or knife.

For
the apples:

4
large apples, peeled and cored

4
tablespoons brown sugar

2
teaspoons Mexican cinnamon

Directions

Preheat
oven to 400 degrees.

Lightly
grease a cake pan.

Place apple on each square. Spoon 1 tablespoon brown
sugar and 1 teaspoon cinnamon into the center of each apple. Moisten corners,
pinching edges of pastry to seal. Brush with slightly beaten egg and sprinkle
with additional sugar. Bake 30 minutes or until crust is golden and apples
are tender.