Preheat the oven to 180℃, line a 4 inch baking tin with baking paper and brush with oil. Set aside.
In a small bowl add the wet ingredients and mix until combined. Add the dry ingredients and stir until smooth.
Pour into the prepared tin and bake for 15-18 minutes until risen and tooth pick inserted into the center comes out clean or with moist crumbs. Remove from the tin and let it cool completely before frosting.
To make the frosting heat the cream and dark chocolate in a microwave for 30-45 seconds until the cream is hot and the chocolate is melting, stir until smooth and set aside to cool and firm up.
Spread over the cooled cake and serve.
Notes
To make the frosting pourable and like an icing add 60gm cream and 30gm chocolate (to a bowl and heat in the microwave for 30-45 seconds until the cream is hot and the chocolate is melting, stir until smooth and set aside to cool and firm up). Pour over the cooled cake, sprinkle with salt, slice and eat or just dig in with a fork.