Peel and slice the onion; set aside.
Combine brown sugar, mirin, soy sauce, and plum syrup (or substitute). Mix well and set aside.
Heat a little oil in a pan. Add sliced onions and cook for 1 minute. Add minced garlic and cook for another minute until fragrant.
Add ground beef and break it into small pieces. Once the beef is about 30% cooked, pour in the sauce. Let it simmer until the sauce reduces and evaporates — stir occasionally.
Drizzle with sesame oil and give it a final mix.
Assemble your bowl with rice, scallions, sesame seeds, and kimchi/ veggie of choice. Enjoy!
