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In a small bowl, combine water and vanilla.
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Sprinkle with gelatin and let soften for 1 minute.
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In a double boiler bring about 1 inch of water to a slight simmer.
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In a heatproof mixing bowl, combine egg whites, syrup, cream of tartar and salt; set bowl over simmering water and beat with an electric mixer on low speed, moving beaters constantly, until an instant thermometer reads 140°F.
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This should take approximately 3 to 5 minutes.
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Increase mixer speed to high and continue beating for 3 minutes.
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Remove bowl from heat.
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Add gelatin mixture and continue to beat until cooled to room temperature, approximately 4 to 5 minutes.
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In a chilled bowl, beat cream with electric mixer until firm peaks form; fold into meringue with rubber spatula.
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Chill the frosting before icing cake with it.