Police are currently searching for the man, who followed a deliveryman into the Five Guys hamburger restaurant in Washington DC.
CCTV footage from the restaurant shows the man switching on a grill before grabbing ingredients from the kitchen to prepare his meal.
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Washington DC Police said the man broke into the restaurant on Irving Street in Washington between 3am and 5am on March 18.
The man, who was wearing a fedora, helped himself to a drink while he was grilling, then took the burger and a bottle of water and left.
Police said the man did not steal any money or other items during his nighttime break in.
They are offering a $1300 reward for anyone with information on the identity of the man.
