Stinger
C.K. Dexter-Haven (Bing Crosby) / Tracy Lord (Grace Kelly)
The morning after the pre-wedding party, Stingers are offered as a hangover cure for Tracy and the other over-indulgers.
“…the juice of a few fresh flowers called a Stinger. Removes the sting.”
Sources: Wikipedia: Stinger (cocktail); BAMF Style: Bing's Navy Blazer in High Society; Cheryl Charming (Miss Charming): Cocktails in Film