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