INGREDIENTS
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For the candied lemon slices:
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3-4 thin skinned lemons, well washed and dried
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3 cups sugar, divided
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3 ¼ cups water + more as needed, divided
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2 tablespoons light corn syrup
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For the cookie dough:
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1 cup (2 sticks) unsalted butter, room temperature
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1/3 cup granulated sugar
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½ teaspoon kosher salt
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1/3 cup powdered sugar, measured then sifted
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1 large egg, separated
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2 teaspoons vanilla extract
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zest of 1 large lemon (about 1 tablespoon)
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2 cups unbleached all-purpose flour
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coarse sanding sugar