For a 9 ½ pie pan, roll the dough out to a 13-inch round. This should give you about 2 inches to crimp.
Whatever your style of crimping, make sure to fold the extra dough under itself, with the edge slightly standing on the pan’s edge. This will give you a nice tall crown! After crimping, place the crust in the freezer for about 20 minutes or until very cold.
Preheat the oven to 375 degrees f. Pierce the bottom of the crust with a fork, and cover completely with foil. Fill with pie weights or beans. Bake for 25 minutes - it’s ok if it’s still doughy. It will bake golden with the custard.
While the crust cools: In a bowl, combine one cup of sugar, butter, and vanilla. Beat till fluffy and add one egg at a time, beating well to incorporate after each addition.
Add the cornmeal mixture; flour, cornmeal and salt. Beat till there are no stubborn dry bits.
Gradually add the room temperature buttermilk, beat until well combined -about 1 minute. Make sure to scrape the sides and bottom, and beat for another 30 seconds.
Pour the filling to the cooled crust. If the berries are frozen, use straight from the freezer. If the berries are fresh, make sure they are dry!
Bake for about an hour, when the pie filling is puffed and golden. Give the pie a nudge, if the middle is too wobbly it may need a bit longer in the oven. The center should only wobble gobble slightly.
Let the pie cool for at least two hours before serving!