I long thought that carrot cake was an American invention, until I found out that an early version was made by Venetian Jews in the original ghetto. This modest disc is not much to look at - apart from a glorious golden-ness - but it is divine to eat. Only those with less austere eating habits will care to dollop alongside each damply crumbling wedge of cake my Italianate nod to the American cream-cheese frosting – a soft, rum-flavoured mascarpone cream.