1. Preheat your oven to 180°C. Grease and line a round spring-form cake tin. Alternatively use a loaf tin, and keep an eye on the cake as the cooking time may vary.
2. Rinse the whole orange, and dry it. Then place it, along with the butter into the Thermomix. Mix for 7 seconds on speed 8.
3. Add the rest of the ingredients and mix on Reverse/20 seconds/Speed 4.
4. Pour into your prepared cake tin and bake for 50 minutes, or until golden brown and cooked through. It smells amazing when cooking. AMAZING.