The Metropolitan cocktail is, essentially, a manhattan in which the whiskey is swapped out for brandy. Gin Fizz — a Harlem club evocative of the Jazz Age — offers this alluring riff on it, laced with Chartreuse and, if you like, a touch of absinthe, too. Serving it in a snifter is an elegant touch — it cleverly telegraphs the presence of brandy — and the orange-raspberry-rosemary garnish adds both flavor and glamour.