Two-Crust Blackberry Cobbler (Crowd Size)

  This is the cobbler your family and guests will remember. BlackberryFilling:  10-12 cups blackberries (3 quarts)    3 cups sugar  1 tsp. cinnamon  2 tsp. vanilla  1-cup flour, or use instant tapioca as a thickener. Mix together and let rest while making pie dough....