Coffee drinkers jam the counters at Starbucks waiting to jump-start their day. But more than half of customers come in after 11 a.m., many looking for something to eat. Expanding the breakfast menu has proven successful—Starbucks’ food business has grown by 50% since 2013 and it plans to double food sales to $5 billion by 2021, said CEO Kevin Johnson at a shareholders meeting last year. “[By] focusing on a specific daypart, we can create new customer occasions … and long-term drivers of growth,” he said. Next up? New lunch offerings, with a fresh-food rollout called Mercato. Launched in April, the lunch menu is in test at 100 Chicago units.