Heat a large skillet over medium heat for about 2 minutes. Add the ground beef, using a spatula to break it up into small pieces. Sauté for 5-7 minutes until the beef is browned and cooked through, draining excess fat.

Add finely diced onion and minced garlic to the skillet with the cooked beef. Sauté for 2-3 minutes, stirring often, until the onion is translucent and the garlic is fragrant.

Stir in the shredded cabbage, mixing it well with the beef and onion mixture. Cook for about 5 minutes, stirring occasionally, until the cabbage wilts and becomes tender.

Pour in the soy sauce or coconut aminos, sesame oil, rice vinegar, ground ginger, and red pepper flakes. Stir everything together thoroughly and cook for an additional 2-3 minutes until the flavors meld beautifully.

Remove the skillet from heat and serve immediately. Garnish each serving with sliced green onions and toasted sesame seeds.