- STEP 1
Preheat oven to 180c/350f/gas 4. Grease a 30 by 20 roasting tin.Line the base and sides with non-stick baking paper.
- STEP 2
Whisk egg whites until stiff peaks form. Sift the flour and cocoa into a seperate bowl. Add egg yolks,marg,caster sugar and milk. Beat with a electric whisk or wooden spoon for 2 mins, until smooth.
- STEP 3
Fold in the egg whites.Spoon the mixture into the tin. Bake for 35-40 mins, or until firm in the centre.Cool completely in the tin.
- STEP 4
For the icing, put the chocolate and 5 tbsp of water into a pan and heat gently until melted. Beat in the icing sugar and oil until smooth.
- STEP 5
Turn out cake and spread the icing on top with a palette knife. Cut into squares and enjoy!