Clover Food Lab is a fast food chain, founded in 2008 by MIT material science graduate and Harvard MBA Ayr Muir, which operates through food trucks and restaurants in Cambridge, Brookline, and Boston, Massachusetts, United States.
The company began in September 2008 as one food truck serving the area around the Massachusetts Institute of Technology (MIT). As of fall 2011, Clover Food Lab had some 70 employees operating in 11 locations, including two Cambridge restaurants (Harvard Square and Inman Square) and six food trucks stationed near MIT, Boston University, Boston's South End neighborhood, Longwood Medical Area, Government Center, Boston Common, Dewey Square and other locations in greater Cambridge.
The company was founded by Ayr Muir, a graduate of MIT in Material Science and Harvard Business School MBA program. Muir, a distant cousin of naturalist John Muir, has cited environmental motivations as a driving force behind the company's creation. He wishes "to shrink the ecological footprint of the food industry by making fresh, local, sustainable vegetarian food as common and convenient as the fare at Burger King or McDonald's". The company's food trucks are decommissioned and retrofitted cargo vehicles that use recycled vegetable oil to help them run. All of the company's utensils, napkins, and other items are compostable. Despite Clover Food Lab's focus on local, sustainable and vegetarian food, Muir consciously avoids branding the company's food as such, fearing that "no one will eat it if we do".
Clover Food Lab's trucks and restaurants have minimalist, somewhat industrial design, and include elements that give them the look and feel of a laboratory. The sides and walls are plain white, menus are written on whiteboards with black dry-erase marker, and the restaurants are brightly lit and have mostly stool seating. The kitchen has "a pop-up quality, as if the crew is here temporarily, planning to relocate elsewhere."
Clover Food Lab's BLT sandwich uses soy bacon, and has been cited as the best BLT sandwich in Boston by Mayor Thomas Menino. The company was a winner of the Food Truck Challenge, a competition initiated by Menino to bring healthy mobile food vending to Boston, which has led to a rising trend in the city in the use of food and coffee trucks. Clover Food Lab was named one of the top 10 food trucks in the United States by The Wall Street Journal, and given the 2011 Best of Boston award for vegetarian food by The Improper Bostonian. The company was one of several food truck services highlighted by The Huffington Post for its intense use of technology (especially social media), distinctive product, and cult-like following.
In July 2013, all Clover locations were closed following a salmonella outbreak, with at least 12 confirmed cases of salmonella poisoning linked to Clover. The source of the salmonella outbreak was later attributed to a Mexican poultry farm, not Clover.
Typically held on the first day of operations of a new Clover location, Pay What You Want Day allows the area to get to know the food and for the staff to work out their pace.  In 2015, Pay What You Want Day was experienced in Central Square with the opening of CloverHFI. The restaurant continues operations for 24 hours, which maintains the tradition of the restaurant it replaced.
Ayr Muir, whose Clover food trucks and restaurants endured a salmonella scare this summer, ... says the outbreak was tracked to a Mexican poultry farm, not Clover.