Ingredients

The following ingredients have 8 Servings
  • oil, for greasing
  • 200g/7oz self-raising flour
  • 50g/1¾oz cocoa powder, sifted
  • 1 tsp bicarbonate of soda
  • 100g/3½oz butter, cubed
  • 100ml/3½fl oz semi-skimmed milk
  • 3 large free-range eggs, beaten
  • 250g/9oz sweet potato, finely grated
  • 1 large very ripe banana (approximately125g/4½oz peeled weight), mashed with a fork

Instruction

  • Preheat the oven to 200C/180C Fan/Gas 6. Grease and line the base and sides of a 23cm/9in loose-based square cake tin with baking parchment.
  • Mix the flour, cocoa and bicarbonate of soda in a large bowl. Make a well in the centre.
  • Put the butter in a medium saucepan and melt over a low heat, stirring regularly. Take the pan off the heat and stir the milk into the melted butter. Add the eggs, sweet potato and banana, stirring vigorously.
  • Pour slowly into the flour mixture, stirring constantly with a wooden spoon to form a thick batter. Pour into the prepared tin.
  • Bake in the centre of the oven for 30-35 minutes, or until the cake is risen and just firm to the touch.
  • Serve warm or leave to cool in the tin before cutting into squares.