1. In a tall glass, fill ice up to the brim.
2. Add the black rum, lime juice and the ginger beer and mix well, using a stirrer.
3. Using the stirrer, insert the slices of lime into the glass.
4. Using a knife, make a slit in one of the slices and smear it with the bitters on both faces. Fit the slice onto the side of the glass, as shown in the video.
5. To be served chilled as the perfect hangover drink to chill out with on a Sunday morning!!