How to make chocolate fudge cake?

Ingredients
100g spreadable butter, plus extra for greasing250ml milk1 tbsp red wine vinegar100g plain chocolate, melted15g cocoa powder, sifted300g self-raising flour, sifted1 tsp bicarbonate of soda, sifted225g golden caster sugar2 eggsFor the icing

Method: How to make chocolate fudge cake
1. Preheat the oven to 180C/fan160C/gas 4. Grease a 20cm round, deep cake tin and line with baking paper. Mix the milk and vinegar.
Place all the other cake ingredients in a large mixing bowl.
Pour in the milk mixture and beat with an electric hand whisk, until smooth.
Spread into the cake tin and bake for 1 hour, until firm in the centre.
Cool for 10 minutes, then turn out on a rack to cool completely.
2. Meanwhile, make the icing.
Melt the chocolate and butter together in the microwave for 3 minutes on medium, stirring halfway through.
Alternatively, melt the chocolate and butter in a bowl over a pan of just simmering water.
Stir until smooth, then beat in the cream.
Cool slightly.
3. Halve the cake through the middle. Spread a quarter of the icing on 1 half and sandwich together. Spread the rest over the top and sides.The cake will keep for up to 3 days in an airtight box.225g plain chocolate, broken up100g butter142ml carton double cream