The traditional Dark 'n' Stormy cocktail is made with dark rum and ginger beer, typically garnished with a lime wedge. It's a simple and refreshing drink with a pleasant combination of the spiciness from the ginger beer and the richness of the dark rum. It's a popular cocktail, especially in regions like the Caribbean. It's worth noting that the name "Dark 'n' Stormy" is a trademark of Gosling's, a brand of dark rum, and they have specific requirements for making an authentic Dark 'n' Stormy cocktail using their rum.