Preheat the oven to 180C/350F/gas mark 4
Use an 18cm/7 inch cake tin.
Grease the cake tin. Whisk the sour cream and sugar until light. Pour in the melted butter, sift in the dry ingredients and add the milk. Mix thoroughly. Turn the mixture into the prepared tin. Bake for about I hour or until a warm knife inserted into the centre comes out clean. Turn out on to a wire rack to cool.
