Investigators say he's done it at five other restaurants but authorities are at a loss to explain the suspect's actions.
"No attempt to take money, no attempt to take food, just pointing the gun at the employees and then drove off, which is somewhat frightening because we do not know what the motive is," said Jim Amormino with the sheriff's department.
Police described the man as white, in his 40s with brown hair and a heavy build. He was driving a dark four door sedan with alloyed wheels.
Anyone with information was asked to call the Orange County Sheriff's Department at 1-8666-847-6273.