175g/6oz soft dark brown sugar
2 large free-range eggs
200g/7oz wholemeal self-raising flour
1 tbsp ground mixed spice
1 tsp bicarbonate of soda
200g/7oz carrots, peeled, coarsely grated
80g/3oz pecan nuts, roughly chopped, plus extra to decorate
1 lemon, zest only
50g/2oz desiccated coconut
For the cake, preheat the oven to 180C/350F/Gas 4.
Lightly grease two 20cm/8in round cake tins and line the bases with baking parchment.
Whisk the sugar, eggs and olive oil together in a large bowl using an electric hand whisk for 3-4 minutes until the mixture is smooth.
Sift the flour, mixed spice and bicarbonate of soda into the bowl, tipping in the grains left in the sieve. Stir in gently. Fold the grated carrot, pecan nuts, lemon zest, sultanas, raisins and desiccated coconut into the mixture.
Spoon the mixture equally into the two cake tins and smooth the surface of each with a spatula. Bake on the centre shelf of the oven for 35-40 minutes. They should be nicely risen and feel firm and springy to the touch when lightly pressed in the centre; if not, cook for a little longer before testing again. When ready, cool for five minutes before removing the cakes from the tin and cooling completely on a wire rack.
For the icing, place all the icing ingredients in a bowl and beat together until light and fluffy. Cover the bowl with cling film and transfer to the fridge for 1-2 hours, until you are ready to ice the cake.
For the sugared carrots, place the carrots in a saucepan and just cover with cold water. Add the salt, sugar and butter. Place over a high heat and bring to the boil. Boil for 5-6 minutes - the carrots will cook as the water evaporates and a glaze will form in the base of the pan. Toss the cooked carrots in the glaze and then remove them from the pan to a plate with a bit more caster sugar. Roll them in a little more sugar, and leave to cool.
When the cakes are completely cold, spread the icing over the top of each cake and layer them up. Just before serving, scatter a few pecan nuts over the top of the cake and garnish with the sugared carrots.
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James Martin presents with help from top chefs Lee Westcott and Paul Ainsworth.