For the frosting
- STEP 1
Heat the oven to 180C/160C fan/gas 4. Oil and line the base and sides of an 18cm square cake tin with baking parchment.
- STEP 2
Tip the sugar, sunflower oil and eggs into a big mixing bowl. Lightly mix with a wooden spoon. Stir in the carrots, raisins and orange zest.
- STEP 3
Sift the flour, bicarbonate of soda, cinnamon and nutmeg into the bowl. Mix everything together, the mixture will be soft and almost runny.
- STEP 4
Pour the mixture into the prepared tin and bake for 40-45 mins or until it feels firm and springy when you press it in the centre.
- STEP 5
Cool in the tin for 5 mins, then turn it out, peel off the paper and cool on a wire rack. (You can freeze the cake at this point if you want to serve it at a later date.)
- STEP 6
Beat the icing sugar and orange juice in a small bowl until smooth – you want the icing about as runny as single cream. Put the cake on a serving plate and boldly drizzle the icing back and forth in diagonal lines over the top, letting it drip down the sides.