01 - Heat a large skillet over medium-high heat. Add the ground beef and cook until fully browned, breaking it into small crumbles with a spoon, approximately 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 the sugar dissolves and the mixture is well combined.
03 - Pour the prepared sauce over the browned beef in the skillet. Stir thoroughly to coat 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 each bowl with toasted sesame seeds.
06 - Serve immediately while hot. Offer extra chili flakes or sriracha on the side for those who prefer more heat.