01 - Heat a large skillet over medium-high heat. Add the ground beef and cook until fully browned, breaking it apart with a spoon, about 5 to 7 minutes. Drain any excess fat if necessary.
02 - In a mixing bowl, whisk together the soy sauce, brown sugar, sesame oil, minced garlic, grated ginger, red pepper flakes, and rice vinegar until well combined.
03 - Pour the sauce mixture over the browned beef in the skillet. Stir thoroughly and let it simmer for 3 to 4 minutes, allowing the beef to absorb the savory-sweet flavors. Adjust seasoning to taste.
04 - Divide the cooked rice evenly among four serving bowls. Spoon the saucy Korean beef generously over each portion of rice.
05 - Arrange the julienned carrot, sliced cucumber, and spring onions over the beef. Sprinkle with toasted sesame seeds for a nutty finish.
06 - Serve immediately while hot. Offer extra chili flakes or sriracha on the side for those who prefer more heat.