Nancy Reagan would have thrown herself from a tall building rather than let a crumb of this intense chocolate and prune d’Agen cake pass her lips. Just the sight of such a calorific sin would cause her to spin on her heels and elegantly jack knife out of the window, performing the only sort swallow that would save her from a fate worse than fatness. One of you out there recommended that I read David Leibovitz’s Paris blog and in following your advice I stumbled across a cool writer and this cake. It has to be said that this is not a “cakey” cake. Children will grimace after the first mouthful as they would on mistaking a single malt for a soft drink, so the cake is safe from under age marauders. David Leibovitz suggests that the prunes, which are an intrinsic part of this recipe, should be marinated in whichever alcohol floats your boat but opines the idea of marinating them in black tea which option I took.