PLACE the mince, onions, VEGEMITE, mirin and sugar in a bowl and mix to combine. Divide into 4 and shape into burgers.
HEAT the oil in a frypan and cook for 2 minutes on each side or until lightly browned. Transfer to a baking tray and bake in a moderate oven 180°C for 8-10 minutes or until cooked through.
ASSEMBLE burgers in rolls with the lettuce, snow peas sprouts and a dollop of salsa. Serve immediately.