Spicy carrot cake with lemon icing

This is perfect for one of those dark autumn afternoons in front of the fire. It's sweet, sticky, spicy and gooey.

225g grated carrots
6 tbsp olive oil
125g soft brown sugar, preferably rapadura
225g wholemeal flour
2-3 tsp baking powder
1 tsp grated nutmeg
1 tsp powdered cinnamon
2 to 3 tbsp honey
4 tbsp fresh orange juice

For the icing:
175g icing sugar
Juice and rind of 1 lemon

Preheat the oven to 170C/325F/gas mark 3 and line an 18cm cake tin with non-stick paper. Mix the carrots, oil and sugar in a bowl, then add the flour, baking powder, nutmeg, cinnamon, honey and orange juice, and mix until everything is well combined - it will be quite sticky.
Spoon into the prepared tin, level the top, and bake for an hour and a quarter or until a skewer inserted into the centre comes out clean (cover the top of the cake with foil if there are signs of burning). Leave to cool in the tin.
Mix the icing sugar with the lemon rind and enough of the juice (about six to eight teaspoons) to make a thick coating consistency. Spread over the top of the cake and leave to set.