The interior of El Celler de Can Roca, named the world's best restaurant.Courtesy of American Express Feed the world. That’s what the Roca Brothers—Joan, Josep, and Jordi—of top-rated Catalan restaurant El Celler de Can Roca have set out to do. Guests who can get a reservation are in for a worldly experience at the restaurant in the medieval city of Girona, Spain, which has been ranked No. 1 twice on the World’s 50 Best Restaurants list. Waiters carry out 3D globes with round, orbiting morsels each resembling a taste of a specific country listed on the menu. Flavors of Japan are...