Brown the meat: In a large skillet, add sesame oil, along with some freshly minced garlic and ginger, and cook it for about 30 seconds over medium-high heat. Then, brown the ground beef in the same pan. Drain any excess grease and then return to the stovetop. Add the soy sauce: Next, stir in brown sugar, soy sauce, and red pepper flakes. Garnish: Lastly, add some chopped green onions to it.  Serve: Enjoy it warm over a bowl of white rice, and garnish with sesame seeds and sliced green onion.