01 - In a small bowl, whisk together the soy sauce, brown sugar, sesame oil, minced garlic, grated ginger, red pepper flakes, rice vinegar, and gochujang until smooth and well combined. Set aside.
02 - Heat a large skillet over medium-high heat. Add the ground beef and cook, breaking it apart with a spatula or wooden spoon, until browned and cooked through, approximately 5 to 7 minutes. Drain any excess fat if necessary.
03 - Pour the prepared sauce over the browned beef, stirring thoroughly to coat. Reduce the heat slightly and simmer for 2 to 3 minutes until the sauce thickens and clings to the beef.
04 - Divide the cooked rice evenly among 4 bowls. Spoon the saucy Korean ground beef 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 hot.