Fill a highball glass with ice cubes.
Pour 120ml of ginger beer into the glass.
Slowly pour 60ml of Gosling's Black Seal Dark Rum over the back of a bar spoon to float it on top of the ginger beer.
Garnish with a lime wedge on the rim and serve immediately without stirring.
The Dark 'n' Stormy is a registered trademark of Gosling Brothers Ltd - legally, only Gosling's Black Seal rum can be used in an authentic version. Resist the urge to stir; the floating rum layer is both the signature visual and the intended drinking experience.
My Bar Shelf reads your shelf and shows you every cocktail you can make from what you already own, including Dark 'n' Stormy.