01 -
Put all the patty ingredients in a large bowl and mix well to combine, ensuring not to overwork the meat.
02 -
Heat a griddle or cast-iron pan to medium-high heat. Add a small amount of neutral oil. Place the patties on the pan and cook to your desired doneness, flipping carefully as the patties are delicate.
03 -
While the patties are cooking, combine the mayonnaise, grainy mustard, and Western chili sauce in a small bowl. Mix well and set aside.
04 -
Toast the buns until golden, either on the griddle or using a toaster.
05 -
Spread some prepared sauce on the buns. Add a cooked patty and top with lettuce and tomato. Serve immediately.