The Dark and Stormy is one of the few trademark protected cocktails in existence. Therefore, for a cocktail to be called a "Dark and Stormy" (by law) the recipe must call for Goslings Black Seal Rum and ginger beer. Nothing more, nothing less. “We defend that trademark vigorously,” said E. Malcolm Gosling Jr., whose family has owned Gosling’s since its founding in Bermuda in 1806. And indeed they should, after all it’s one helluva cocktail.