In Madrid, at Pictura Bar in the Mandarin Oriental Ritz, David Ferrero is that barkeep in classic style without embellishment. His dress matches his perspective on the art. We reminisce about classic cocktails, the martini, and a true daiquiri in particular. He notes that in an increasingly complex world, throw-back simplicity is refreshing, and Hemingway’s spirit lingering at the bar agrees. Here is