Prepare pie pastry. Line with a double thickness of foil. Bake in a 450 degree F oven for 8 minutes. Remove foil. Bake for 4 to 5 minutes more or until crust is set and dry. When crust is done, reduce oven temperature to 350 degree F.
In a heavy saucepan, melt butter and chocolate together over low heat, stirring frequently. Remove from heat and cool slightly.
Meanwhile, in a large mixing bowl, beat eggs with an electric mixer on medium speed for 4 to 5 minutes or until thick and light-colored. Beat in sugar, corn syrup, vanilla, and salt. Then, beat in chocolate mixture.
Pour mixture into the partially baked pastry. Bake in 350 degree F oven for 35 minutes (center will still be soft). Do not overbake. Serve warm or cool with ice cream. Makes 8 servings.
For a brownie sundae, serve pie with your choice of toppers to spoon and sprinkle over the ice cream.