Step 1: Ingredients and middle crust
Pastry for 9-inch double-crust pie (store bought or hand made)
1 cup sugar
2 tbs all-purpose flour
2 tsp vanilla extract
1/4 cup cold water
1 lb blackberries
1/2 lb raspberries
2 tbs cold butter, chopped into small pieces
Heat the oven to 450F.
Roll out a third of the dough and trim it to make a 9-inch square. Place it on an aluminum foil-lined baking sheet, and place in the oven until the square is lightly browned, about 10 minutes. Set aside to cool. Leave the oven on.