The world’s best bartender has retired after nearly 30 years running the Bar Hemingway at the Ritz Hotel in Paris. He has perfected the skill of guessing the cocktail you would like based on what you’re wearing, who you’re with, and the personality you give off.

Colin Field has made cocktails for the likes of Kate Moss, Johnny Depp, and Bruce Willis, including a cocktail worth €1400 and joined Sean Moncrieff on the show...