Preheat outdoor grill to high or stovetop skillet to medium high.
Place ground pork into a large bowl then add brown sugar, soy sauce, sesame oil, and onions. Gently mix together with your hands until just incorporated. You don't want to overwork the meat.
Form into patties - large or small, but not too thick otherwise it'll take forever to cook.
Grill or cook on the stovetop until fully cooked through.
Assemble burgers with gochujang mayo sauce and kimchi on top!