INGREDIENTS
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3 cups all-purpose flour, plus more for flouring
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2/3 cup granulated sugar
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1 tablespoon plus 1 teaspoon baking powder
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1/4 teaspoon salt
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1 cup (2 sticks) cold unsalted butter, cut into pieces
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1 cup heavy cream
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1 egg
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2 lemons
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Leaves from 2 rosemary sprigs (or 4 if they're small sprigs), finely minced
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5 cups powdered sugar
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1/2 cup whole milk, plus more if needed for thinning