INGREDIENTS
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1 1/4 sticks unsalted butter, softened (10 Tbsp.)
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2 tablespoons golden syrup (such as Lyle's) or dark corn syrup
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1 cup dark brown sugar, packed
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1 cup all-purpose flour
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1/2 teaspoon baking soda
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3 tablespoons unsweetened cocoa powder, sifted
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2 eggs
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Zest of 2 small oranges (1 Tbsp.) and juice of 1 small orange (3 Tbsp.)