Butter Pecan Ice Cream Pie

Why I Love This Recipe
A simple nut crust and a smooth caramel sauce are all the preparation required for this impressive dessert. Be sure to start making it at least 12 hours before serving.
Ingredients You'll Need
Caramel Sauce:
6 tablespoons (3/4 stick) unsalted butter
1 1/2 cups (packed) golden brown sugar
3/4 cup whipping cream
Pinch of salt
1/2 teaspoon vanilla extract
Crust:
1/3 cup (packed) golden brown sugar
1/4 cup (1/2 stick) unsalted butter, room temperature
1 teaspoon vanilla extract
2/3 cup all purpose flour
2/3 cup chopped pecans, lightly toasted
1/2 gallon butter pecan or almond praline ice cream, softened slightly
36 to 40 pecans halves, toasted (optional)
Directions
For Sauce: Melt butter in heavy medium saucepan over medium heat. Add sugar, cream and salt and whisk until sauce is smooth and comes to simmer. Remove from heat; mix in vanilla. Cool sauce completely, stirring occasionally.
For Crust: Preheat oven to 350°F. Butter bottom of 9-inch-diameter springform pan.
Using electric mixer, beat brown sugar, butter and vanilla extract in medium bowl until smooth.
Add flour and 2/3 cup chopped pecans and stir until moist clumps form.
Press dough onto bottom and 1/2 inch up sides of prepared pan.
Bake until crust is set and beginning to brown, about 12 minutes. Cool crust completely.
Spoon ice cream into crust, pressing to compact. pour 1/2 cup sauce over.
Using tip of small knife, swirl sauce and top layer of ice cream, creating marbled pattern.
Cover pie and freeze 12 hours. (Sauce and pie can be prepared 3 days ahead. Cover remaining sauce and refrigerate. Keep pie frozen.)
Run small sharp knife around pan sides to loosen pie. release pan sides. Arrange toasted pecan halves decoratively around top edge of pie, if desired. Let pie stand 5 minutes to soften slightly.
Rewarm remaining sauce. Cut pie into wedges and serve with sauce.