A very quick and satisfying meal with lots of flavor and only a few ingredients. Serve over rice, with sesame seeds and chopped scallions on the top if you like. You can improve the flavor by using fresh garlic and fresh ginger, but powdered works fine, too. The proportions are flexible, and you can easily add more of any sauce ingredient at the end of cooking.
Heat the sesame or other oil in a skillet. Lightly cook then garlic, then add the ground beef and cook, breaking into bits, until the meat is all browned. Drain most of the fat.
Mix together the brown sugar, ginger, soy sauce, and pepper flakes, and add to the ground beef. Or you can actually just chuck everything in the pan and stir it up right there. Cook a little longer until everything is combined and hot.
Serve over rice and garnish with scallions and sesame seeds.