In a small bowl, mix the fish sauce, sugar, garlic powder and pepper. In a larger bowl, break up the ground beef into chunks with your hands. Pour the fish sauce over the beef and, using your hands, mix everything together thoroughly. Marinate for 30 minutes on the counter (you can also marinate it in the fridge overnight to build even more flavor).
Form your burger patties, again with your hands. Depending on the size of the buns you’re using, you can make 4 quarter-pound patties or 3 third-pound patties. Smoosh them out to the bun size and then press a dent in the middle with your thumb. This will keep them from getting domed in the middle as they cook.
Heat some oil in a skillet over medium or slightly higher heat. Let it get good and hot. Add the burger patties and let them cook undisturbed for about 4 minutes. Flip them and lightly press them down with a spatula, then cook 3 to 4 minutes. For medium-rare, an instant read thermometer should register 130 – 135ºF, but cook to your liking.
Plate the burgers on buns and dress with the condiments of your choice. For me, that’s pickles, mustard and maybe some cheese. Enjoy.