INGREDIENTS
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Vegetable oil, cooking spray
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3 cups all-purpose flour, plus more for pans
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1 cup boiling water
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3/4 teaspoon baking soda
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2 1/2 teaspoons ground ginger
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2 1/2 teaspoons ground cinnamon
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1/2 teaspoon ground nutmeg
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1/4 teaspoon ground cloves
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3/4 teaspoon salt
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1 teaspoon baking powder
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1/2 cup (1 stick) unsalted butter, softened
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3/4 cup packed light-brown sugar
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1 tablespoon finely grated orange zest, plus 1/4 cup fresh orange juice
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1/2 cup unsulfured molasses
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1/4 cup Cointreau (optional)
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1/4 cup dark corn syrup
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2 large eggs, lightly beaten
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1/2 teaspoon pure vanilla extract
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1 cup walnuts, toasted, finely chopped
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Seven-Minute Frosting
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Chocolate Leaves
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1/2 ounce marzipan