In a small heavy saucepan, combine the sugar, cornstarch and flour.Stir in water until smooth. Cook and stir over medium-high heat until thickened and bubbly. Reduce heat; cook and stir 2 minutes longer.
Remove from the heat. Stir a small amount of hot mixture into egg yolks; return all to the pan, stirring constantly. Bring to a gentle boil; cook and stir 2 minutes longer. Remove from the heat. Gently stir in the lemon juice, butter and lemon peel.
Cover surface with waxed paper; refrigerate until chilled.
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