Combine first 4 ingredients in a heavy saucepan; stir well. Stir in fruit rind and juices. Cook over medium heat, stirring constantly until mixture thickens and boils. Gradually stir in about 1/4 cup of hot mixture into egg yolks; add to remaining hot mixture, stirring constantly. Return to a boil; cook 1 to 2 minutes, stirring constantly. Remove from heat and cool completely. (Mixture will be thick).
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