Meanwhile, in 2-quart saucepan, beat 2 cups whipping cream and the cornstarch with whisk until dissolved. Beat in egg yolks and 3/4 cup sugar until blended. Cook over medium-low heat, stirring constantly, until mixture boils. Boil 1 minute, stirring constantly. Remove from heat. Stir in 3/4 cup coconut, the butter and 1 1/4 teaspoons vanilla. Pour into cooled baked shell; cover with plastic wrap, and refrigerate 15 minutes.