Baking with Whole Grains: Whole Wheat Puff Pastry

INGREDIENTS

For the dough:

3 cups

(10 1/8 oz.)

whole wheat pastry flour

3 cups

(12 ¾ oz.) unbleached bread flour

2 tbsp

nonfat dry milk

4 tbsp

chilled unsalted butter, cut into small pieces

2 tsp

salt

1 1/2 cups

plus 2 tbsp. (13 oz.) water

For the butter square:

2 cups

unsalted butter, softened but still cool

1/3 cup

whole wheat pastry flour

Unbleached all-purpose flour, for dusting the work surface