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Turn temperature control of refrigerator to coldest setting.
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Soften gelatin in 2 tablespoons of milk.
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Scald rest of milk in double boiler, then stir in Sweet'N Low and salt.
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Cook 2 minutes, stirring often, then slowly stir into beaten egg yolk.
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Return to double boiler; cook over hot, (not boiling) water 2 minutes or until mixture coats spoon.
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Add gelatin, then vanilla; stir until dissolved.
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Pour into freezing tray.
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Refrigerate 5 minutes or until partially firm.
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Turn into chilled bowl; with electric mixer or egg beater, beat until creamy and free from lumps.
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Fold in stiffly beaten egg white.
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Return to tray and freeze until just firm.
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Then reset temperature control.