1 to 2 juicy limes (you need 1-ounce juice and a wheel for garnish)
1 ounce golden rum,(recommended: Mount Gay)
6 ounces ginger beer
1/2 ounce dark rum, (recommended: Meyers's)
Fill a highball glass or large wine goblet with ice cubes. Add the lime juice and the golden rum. Top off with the ginger beer and stir lightly. Float a layer of the dark rum on top by pouring it over the back of a wide, flat spoon. (Don't worry if it doesn't float; it tastes great either way.) Garnish with the lime wheel. Drink.