"Basic Buttercream and Variations..."
INGREDIENTS
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6 egg whites
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1 1/4 cups (8 3/4 ounces) sugar
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1/4 teaspoon cream of tartar
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2 cups (1 pound) unsalted butter, at room temperature, cut into small cubes
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2 teaspoons pure vanilla extract
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1/8 teaspoon fine sea salt