The Canadian hamburger style topped with a distinctive chili meat sauce is the Fat Boy.
The Fat Boy originated in Winnipeg, Manitoba, where it became associated with Greek-owned burger restaurants and drive-ins. It is usually a beef hamburger covered with a seasoned chili meat sauce, along with toppings such as dill pickles, tomatoes, lettuce, mayonnaise, and mustard.
The style is rooted in Winnipeg’s independent burger culture rather than a single nationally standardized chain. Several restaurants have claimed connections to its invention, and different establishments use their own sauce recipes and topping combinations. Juniors is often mentioned in accounts of the burger’s early history.
A related Winnipeg order is sometimes called a chilli burger: meat sauce is placed over the burger, often generously enough that a fork is useful. The Fat Boy is therefore not a rice burger, patty melt, or Jucy Lucy, each of which describes a different preparation or filling.