This elegant, single-layer cake features a supremely moist, tender crumb infused with fresh orange zest and juice, topped with a rich, glossy chocolate ganache. The bright citrus notes perfectly balance the deep, bittersweet chocolate for a sophisticated dessert that’s surprisingly simple to prepare.
Storage: Store the cake, covered at room temperature in a cake dome or under a large inverted bowl, for up to 2 days. For longer storage, refrigerate for up to 5 days; let slices come to room temperature for 30 minutes before serving. Freezing: Wrap the unfrosted, cooled cake tightly in plastic wrap and then aluminum foil; freeze for up to 3 months. Thaw overnight in the refrigerator, then bring to room temperature and frost. The ganache can be made ahead and refrigerated for up to 5 days; reheat gently in 10-second intervals in the microwave, stirring until fluid again.
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