In a heavy saucepan, dissolve the cornstarch in the cream; stir in sweetened condensed milk and egg yolks. Cook and stir until thick and bubbly. Remove from heat add butter and vanilla. Pour into pastry shell and chill for 2 or more hours. Top with sugar and brown under the broiler. Garnish with sweetened whipped cream around the edge. Refrigerate leftovers.
A viewer or guest of the show, who may not be a professional cook, provided this recipe. It has not been tested for home use.