For a lemon traybake, replace the cocoa and milk with the zest of 2 lemons, plus 1 tbsp of lemon juice and also use the lemon juice for the icing instead of water.
1 Preheat the oven to 180°C/fan 160°C/gas mark 4. Grease and line a 12 x 9 inch (30 cm x 23 cm) roasting tin (or any similar tin will do) with greaseproof paper.
2 Measure all the ingredients into a large bowl and beat well for about 2 minutes with an electric hand whisk until well blended. Turn the mixture into the prepared tin and level the top. You may want to make a bit of a dip in the centre to ensure the sponge comes out flat.
3 Bake in the pre-heated oven for about 35 – 40 minutes or until the cake has shrunk from the sides of the tin and springs back when pressed in the centre with your fingertips. Leave to cool in the tin.
4 For the icing: sift the icing sugar into a bowl, gradually add the water to the icing sugar until it is smooth and spreadable. Add some food colouring for a stronger visual effect.
Get the kids involved with this recipe and sorry about the mess!
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