1/4 teaspoon salt (ONLY if you use unsalted butter)
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1/2 cup (4 ounces) boiling water
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1/4 cup (1 ounce) meringue powder
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1 tablespoon (1/2 ounce) vanilla extract
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4 cups (16 ounces) sifted confectioners’ or glazing sugar
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2 cups (4 sticks, 16 ounces) soft butter, vegetable shortening, or a combination of both*
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*We love the flavor of butter, but if your cake will be sitting in a hot place, using some (or all) vegetable shortening will help keep the frosting from melting.