In a large pan melt the butter and sugar over a low heat. Gently simmer for a few minutes stirring occasionally taking care not to burn the sugar.
150 g butter, 150 g soft dark brown sugar
Take off the heat and add the cream and mix until well combined.
150 g double or single cream
Cool a little and pour into a clean sterilised jar if you are not serving the Toffee Sauce until later. It will set firmly in the fridge so you may need to warm it gently again or give it a good mix before serving.
Preheat the oven to 180°C fan assisted oven. Grease and line an 8 inch square cake tin with baking parchment.
Using an electric mixer, beat together the butter and sugar until well mixed with a light fluffy texture.
200 g butter at room temperature, 200 g soft brown sugar
Gradually add the lightly beaten eggs, adding a little flour to help prevent curdling. Beat until well combined.
3 Medium eggs lightly beaten
Add the remaining flour, ground nutmeg, mashed banana and give everything a good mix until well combined.
225 g Self Raising flour, ½ teaspoon ground Nutmeg, 2 large ripe bananas
Pour the cake batter evenly into the prepared tin. Bake in the centre of the oven for approx 35 - 40 minutes, or until baked, testing the centre of the cake with a skewer until it comes out clean.
Leave to cool a little before serving with the Toffee Sauce.