Meanwhile, in 1 1/2-quart saucepan, mix 1 cup sugar and the cornstarch. Stir in water, lemon juice and egg yolks. Cook over medium heat, stirring constantly, until mixture thickens and boils. Boil 1 minute; remove from heat. Reserve 1/2 cup lemon mixture. Stir cream cheese and lemon peel into remaining 1 1/2 cups lemon mixture until smooth. Press plastic wrap on surfaces of each mixture (this helps prevent a "skin" forming on top). Refrigerate about 30 minutes or until cool.