Preheat oven to 160°C. Grease and line 2 x 6" cake tins and line with paper. Grease the paper too. Being a runny batter it can stick easily.
Place sugar into the Thermomix bowl. Mill 10 sec/speed 10. Add flour, cocoa, espresso powder, baking soda, baking powder and salt. Combine 10 sec/speed 10. Set aside.
Place EVOO, eggs and vanilla into the Thermomix bowl. Mix 3 min/Butterfly/speed 3. Add Buttermilk and mix 1 min/Butterfly/speed 3.
Add flour mix and brewed coffee and combine 5 sec/Butterfly/speed 3. Scrape and repeat.
Pour into prepared tins and bake for 1 hour. Or until it bounces back when touched gently.
Leave in tins for 10 minutes, then turn out onto a wire rack to cool completely.
Ice cake as desired or serve with Ice Cream, whipped cream or both.