Simple chocolate fudge cake

Method

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.