Brown the Beef: Heat a large skillet over medium-high heat. Add the ground beef and cook, breaking it apart with a wooden spoon, until it is browned and crispy in spots. If there is excess grease, carefully drain it, leaving just a little bit for flavor.
Aromatics: Reduce the heat to medium. Add the minced garlic and grated ginger to the skillet. Stir constantly for about 1 minute until fragrant and softened.
Simmer the Glaze: In a small bowl, whisk together the soy sauce, brown sugar, sesame oil, and red pepper flakes. Pour this mixture over the beef.
Reduce: Let the beef simmer in the sauce for 3 to 5 minutes. The sauce will thicken slightly and coat the meat, creating a rich, glossy finish.
Assemble: Serve the savory beef over warm bowls of rice. Generously top with sliced green onions and sesame seeds. Add your favorite extras like cucumber or kimchi for crunch.