Competing with the likes of Buyk, Jokr, and GoPuff, the company has opened a ghost store in New York and will use real employees to operate it. DoorDash is diving into the ultra-fast grocery delivery game. It said this morning that it has opened a warehouse in New York’s Chelsea neighborhood—a so-called DashMart—that stocks more than 2,000 grocery items, household goods, and prepared foods.