Clear Lemon Filling

1 cup granulated sugar
4 tablespoons cornstarch
1/2 teaspoon salt
1 cup water
2 tablespoons grated lemon rind
1/2 cup lemon juice
2 tablespoons butter

Mix all ingredients in saucepan. Bring to boil; boil 1 minute, stirring constantly. Chill before using.

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