Cut up the 6 tablespoons butter into 1/2 inch pieces. Place the cut up butter, shortening, and vodka into the freezer. Fill a measuring cup about a 1/2 cup full of cold water and ice and put it in your refrigerator. Leave the butter, shortening, vodka and water in the freezer/refrigerator for 30 minutes.
To the bowl of your food processor, add 3/4 cup all purpose flour, 1/2 tsp salt, and 1 TBSP granulated sugar. Pulse until just combined.
Add the chilled butter and shortening.
Pulse until it is combined and there are no streaks of flour left.
Add the last 1/2 cup of flour.
Pulse until it is combined, broken up, and evenly distributed around the bowl.
Pour the mixture into a large bowl and add 2 tablespoons of cold vodka and 2 tablespoons ice water.
With a stiff spatula work the dough into a ball.
Turn the dough out, shape into a disk, wrap with plastic and refrigerate for an hour.
Using a lot of flour, roll the dough out.
Once the dough is rolled out, use the rolling pin to roll it up and transfer it into the pie plate.
Press into the pie plate, trim off the extra dough, and pinch the edges.
Line the crust with aluminum foil and pie weights or coins and bake at 375 degrees for 25 minutes to prebake the crust, or fill and bake following the instructions in the pie recipe you are using.