Method
1. Line in cake tin
2. Add butter, dark chocolate, coffee powder and water to a clean large saucepan
3. Melt slowly until completely melted and let cool - approx 5 min, low heat
4. Add self raising flour, plain flour, cocoa powder, bicarbonate of soda and caster sugar to a clean large glass bowl
5. Stir gently until well combined
6. Add egg, walnut oil and low fat yogurt to a clean small bowl
7. Whisk thoroughly until smooth then set aside
8. Make a well in the middle of the mixed dry ingredients, pour a little by little each of the wet mixtures and stir, until all is incorporated
9. Pre-heat oven - 160°C
10. Pour batter to the cake tin
11. Bake - 2 hr 25 min, 160°C
12. Check until skewer tests clean
13. Transfer onto cooling rack
14. Let cool, then turn out and serve