If you tried to argue with someone about whether or not a Dark 'n Stormy can be made with a rum other than Gosling’s, you would lose. It can't — seriously, it's the law. The company actually trademarked the drink so that only those made with their rum can legally be called a Dark 'n Stormy.
In a tall glass filled with ice, add ginger beer and top with rum. Garnish with a lime wedge.