INGREDIENTS
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1 cup (2 sticks or 227g) unsalted butter, room temperature
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1/2 cup (115g) shortening
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2 teaspoons fresh lemon juice (or 1 tsp lemon extract, pure vanilla extract, or almond extract)
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6 cups (just over a pound) confectioners\' sugar
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1/4 cup (60g) whole milk*
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2 teaspoons meringue powder**
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1/2 teaspoon table salt