Blackberry Custard Pie  recipe courtesy Mass Recipes    1 unbaked 9 inch pie shell  2 c. fresh blackberries  4 eggs  2/3 c. sugar  1 1/3 c. milk  1 tsp. vanilla    Sprinkle blackberries in bottom of pie shell. Mix beaten eggs, sugar, milk and vanilla together and pour over blackberries. Bake at 400 degrees until custard tests done with a knife coming clean when stuck halfway between the rim and the middle.