The term signifies a specific preparation method, most notably associated with a particular fast-food chain on the West Coast of the United States. It describes a mustard-cooked patty, grilled with a thin layer of mustard, and includes additions like pickles, grilled onions, and a special sauce, often served on a burger. The designation is primarily used to customize orders within the establishment, indicating a preference for this distinct combination of flavors and ingredients.
The popularity of this customization stems from its perceived enhancement of the burger’s taste profile. The mustard-cooked patty adds a tangy flavor, while the grilled onions provide sweetness and depth. The pickles contribute a refreshing crunch and acidity, balancing the richness of the beef and sauce. This specific combination has gained a loyal following, becoming a widely recognized and sought-after customization within the establishment’s menu offerings, solidifying its place in regional culinary culture.