Instructions: Makes 1 cup of filling (enough to fill a 9-inch layer cake). Can be doubled.

Combine sugar, cornstarch and salt in top of double boiler. Gradually stir in water, lemon juice, butter and lemon peel. Heat water to a simmer; cook, stirring contstantly, for 5 minutes. Cover and cook gently for 10 minutes without stirring.

Remove from heat and whisk in egg yolks. Return to heat and cook, stirring constantly, 2 minutes. Remove from heat and stir gently until cool.

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