1 (9 inch) unbaked pie crust
2 tablespoons unsalted butter, melted
1 cup cooked and mashed sweet potatoes
2 eggs, beaten
3/4 cup light brown sugar
1/2 teaspoon ground ginger
1/2 teaspoon ground cinnamon
1/2 teaspoon freshly grated nutmeg
1 teaspoon vanilla extract
1/2 teaspoon salt
1/2 cup dark corn syrup
1 cup evaporated milk
1 1/2 cups chopped pecans
2 cups heavy whipping cream
3 tablespoons confectioners’ sugar
1/4 cup hazelnut liqueur
1/4 cup pecan halves