The guion is a lovely old 19th-century cocktail, named for the family behind the guion line steamship company and likely invented at the waldorf-astorias bar. Like many other drinks of the era, its a strong one but the strength of the alcohol is tamed a bit by the vermouth and the benedictine (a sweet herbal liqueur). The recipe calls for a float of benedictine, but dont feel bad if yours sinks to the bottom. Benedictine has a higher specific gravity than gin, so its tendency is to sink to the bottom. But its no loss if it does, because itll still taste absolutely delicious.