Caramel Nut Tart

Preheat oven to 450F.
Prepare Pastry for Single-Crust Pie: In a medium bowl stir together 1-1/4 cups all-purpose flour and 1/4 teaspoon salt.
Using a pastry blender, cut in 1/3 cup shortening until pieces are pea size.
Sprinkle 1 tablespoon cold water over part of the flour mixture; gently toss with fork.
Push moistened dough to the side of the bowl.
Repeat moistening flour mixture, using 1 tablespoon water at a time until all the flour mixture is moistened (about 4 to 5 tablespoons cold water).
Form pastry into a ball.
On a lightly floured surface, roll dough into a circle about 12 inches in diameter.
Wrap pastry circle around the rolling pin to transfer it; unroll circle into a 9-inch pie plate.
Ease into pie plate without stretching it.
Trim pastry to 1/2 inch beyond edges of pie plate.
Fold under extra pastry.
Crimp edges as desired.
Prick pastry with a fork.
Line pastry with a double thickness of foil.
Bake in the preheated oven for 8 minutes.
Remove foil.
Bake for 5 to 6 minutes more or until golden.
Cool on a wire rack.
Reduce oven temperature to 375F.
In a heavy 1-quart saucepan combine butter, brown sugar, and corn syrup.
Bring to boiling over medium heat, stirring frequently.
Remove from heat.
Stir in nuts and vanilla.
Pour filling into cooled crust, spreading evenly.
Place tart pan on a baking sheet.
Bake in the 375F oven for 20 minutes.
Cool on a wire rack for 15 minutes.
Remove sides of pan.
Cool completely.
If desired, serve with sweetened whipped cream.