Heat oven to 400°F. Grease 9-inch tart pan with removable bottom with shortening; lightly flour. Place pie crust in pan as directed on box for One-Crust Filled Pie. Press in bottom and up sides of pan; trim edges if necessary. Prick bottom of crust with fork. Bake 10 minutes or until golden. Cool crust 10 minutes. Reduce oven temperature to 325°F.
Meanwhile, in 2-quart saucepan, heat sugar, corn syrup and butter over medium heat, stirring frequently, until butter is melted and sugar is dissolved. Remove from heat; cool slightly. Add eggs, vanilla and salt; stir well. Stir in pecans, macadamia nuts and almonds. Spoon filling into partially baked crust.
Bake 55 minutes or until set. Cool completely on cooling rack, about 45 minutes. Serve with ice cream.