Preheat toaster oven to 350. If you don't have a toaster oven, you can use your regular oven, it's just not as fun.
Use an un-greased large ceramic ramekin (approx. 9.5 oz - 4 5/8" DIA).
Add tigernut flour, cocoa powder and baking soda into ramekin. Use a spoon to smash all lumps and combine.
Add egg, ghee, date syrup, stevia and vinegar into the ramekin. Use a fork to mix into a smooth batter. Remember to scrape the bottom edges and sides until throughly mixed.
Bake for 20 min. Serve while still warm.