Preheat the oven to 180℃/160°C Fan/gas mark 4/350°F. Line the base of your cake tin with re-usable non-stick silicone liner or baking parchment and grease the sides with olive oil.

Toast the pine nuts by browning in a fatless pan; the oven alone is not enough to scorch out the paleness.

Grate the carrots in a processor (for ease) or with a coarse grater, then sit them on a double layer of kitchen roll and wrap them, to soak up excess liquid.

Put the golden sultanas in a small saucepan with the rum, bring to the boil, turn down and simmer for 3 minutes.

Whisk the sugar and oil until creamily and airily mixed.

Whisk in the vanilla extract and eggs and when well whisked, fold in the ground almonds, nutmeg, grated carrots, golden sultanas (with any rum that clings to them) and, finally, the lemon zest and juice.

Scrape the mixture into the prepared cake tin and smooth the surface with a rubber spatula.

Sprinkle the toasted pine nuts over the cake and put it into the oven for 30-40 minutes or until the top is risen and golden and cake tester comes out sticky but more or less clean.

Remove from the oven and let the cake sit in its tin on a wire rack for 10 minutes before unspringing and leaving it on the rack to cool.

Remove the cake to a plate to serve; mix the mascarpone with the icing sugar and rum and put in a bowl to spoon alongside, for those who want.