1. Preheat oven to 160 degrees Celsius. Generously grease a 2 cup baking dish OR a cupcake baking dish (for individual servings) and set aside.
2. Sift together the cacao or cocoa powder and flour into a medium sized bowl; set aside.
3. In a stand mixer, or using a handheld electric mixer, beat the sugar and eggs on medium-high speed until very pale and light yellow, 5 or so minutes.
4. Reduce the mixer speed to low and add the vanilla extract and the cocoa & flour mixture, mixing only until combined. Whilst still on low speed, slowly pour in the melted butter and mix again until just combined.
5. Pour the mixture into the prepared baking dish or cupcake dish, and place into a larger baking pan. Add enough hot tap water to come halfway up the sides of the baking dish.
6. Bake for 40 minutes, testing with a toothpick. It should come out with a few crumbs attached and the centre will appear under-baked. Remove the baking dish from the larger pan and place on a wire rack to cool.
7. Serve at room temperature with a generous drizzle of Lewis Road Organic Single or Double Cream, which is the perfect partner for this decadent dessert!
8. Leftovers (We highly doubt you'll have any!) should be stored, covered, in the refrigerator for up to 3 days.