Mix thoroughly the sugar, cocoa, salt, flour and bicarbonate of soda in
a mixing bowl.
Add the oil, vanilla essence and vinegar and pour cold water over the mixture. Beat well with a fork.
Pour into two greased sandwich tins. Cook at 180°C/350°F/Gas Mark 4 for 30 minutes or until the cake springs back lightly when pressed. Cool thoroughly.
Make the icing: Combine the first four ingredients in a saucepan and bring them to the boil slowly, stirring constantly.
Boil for 1 minute.
Remove from the heat and beat until cold (you can do this in a bowl of cold water, but let it cool a bit first or the icing sticks to the bottom of the pan). Mix in the vanilla essence.
Sandwich the cakes together with a thin spread of hazelnut carobella and/or your favourite jam/fruit spread.
Put chocolate icing on the top, then flakes of chocolate (just cut the chocolate really finely with a sharp knife and/or grate the chocolate).
Maybe you can get the frosting to work. I'm not sure what happened with mine but it's pretty runny. I suspect the tbsp given in that recipe are not equivalent to 15 mL.
That would be awesome. :) Various people have made good cakes using this, including huge16 at the Bake-off a few years ago:
Chocolate Cake
225g/8oz caster sugar
4 dssps cocoa powder
1 tsp salt
225g/9oz plain white flour
85g/3oz plain wholemeal flour
1.5 tsp bicarbonate of soda
170ml/6fl oz vegetable oil
2 tsp vanilla essence
4 tsp vinegar
350ml or 2/3 pint cold water
Choc icing:
55g/2oz margarine
4tbsp soya milk
140g/5oz sugar
30g/1oz cocoa powder, sieved
1 tsp vanilla essence
Decoration:
50g/2oz plain chocolate
a mixing bowl.