01 - In a small mixing bowl, whisk together the soy sauce, brown sugar, sesame oil, minced garlic, grated ginger, red pepper flakes, rice vinegar, and gochujang if using. Set aside.
02 - Heat a large skillet over medium-high heat. Add the ground beef and cook, breaking it apart with a spatula, until browned and cooked through, approximately 5 to 7 minutes. Drain any excess fat if needed.
03 - Pour the prepared sauce over the browned beef and stir well to combine. Simmer for 2 to 3 minutes until the sauce thickens slightly and evenly coats the beef.
04 - Divide the cooked rice evenly among 4 serving bowls. Spoon the saucy Korean ground beef mixture over each portion of rice.
05 - Top each bowl with sliced green onions, toasted sesame seeds, julienned carrot, thinly sliced cucumber, and kimchi if desired. Serve immediately while warm.