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This is a rich, fragrant ginger cake with a crunchy raw-sugar coating and moist crumb. The combination of grated fresh ginger root and powdered ginger, along with black pepper and cloves, gives it a particularly intense spice flavor. Make sure to use a good stout here. Since you’ll only use part of a bottle, choose one you’d be happy to finish off while the cake is in the oven. As with most gingerbread, this is a good keeping cake, and can be made a day or two ahead. Store it wrapped in foil at room temperature. Then serve it with cream whipped with a little crème fraiche or sour cream for tartness, which will offset all that crunchy sugar coating the cake.