Roll the beef into 6-8 balls. Split each beef ball in half and flatten out to your preferred patty size. Place about 2-3 tablespoons cheese in the center of one patty, then top with the other patty and seal the edges by pinching and smoothing with your fingers. .
Combine the ground beef, fish sauce (or worchesteshire), garlic, pepper, and sugar in a bowl. Mix together well.