Everyone loves free food. And a few lucky people will be getting just that on Monday at Super Duper.

The burger outpost is offering a free, four ounce mini burger to the first 100 people in line at its five Bay Area locations starting at 3:00pm. The offer is good at all the locations (Four in San Francisco: 2304 Market Street, 721 Market Street, 783 Mission Street, 2201 Chestnut Street; One location in Mill Valley: 430 Miller Avenue). The burgers will be topped with all the fixings: cheese, lettuce, tomato, onions and Super sauce).

Super Duper, which celebrates sustainability and using organic products when possible, is dubbing the promotion “Super Duper Day.”