Carrot cake fans seem to fall into two categories: those who insist their carrot cake should be light, fluffy and cloud-like; and those who prefer a believe the perfect carrot cake is dense, moist and rich. I fall into the latter. The only thing the two camps seem to agree on is that the cake should definitely include a thick layer of cream cheese frosting with a citrusy hint. Historically carrots were a good source of sweetness when sugar and dried fruits were extremely expensive. Carrot cake seems to have its roots in a sweet meat dish. Much like mincemeat, it slowly lost its meat and gained sugar over the centuries. During the second world war, carrot cake took off, making the best use of a home grown source of sweetness. The oil in the mixture means this is a beautifully moist cake which will keep very well. Once the frosting has been added, the cake should be refrigerated. A butter-based cake will firm up in the fridge, but the oil in this cake means it will stay moist even...