INGREDIENTS
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1/2 cup (1 stick) unsalted butter, room temperature
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1 cup confectioners' sugar
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1/2 teaspoon pure vanilla extract
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1 teaspoon packed finely grated lemon zest
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1 teaspoon coarse salt
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1 cup all-purpose flour, (spooned and leveled)
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1/2 cup fine cornmeal
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1 medium zucchini, grated on small holes of a box grater (about 1 cup)