In a small bowl, whisk together brown sugar, soy sauce, sesame oil, red pepper flakes, and ground ginger until well combined.
Heat the vegetable oil in a large cast iron skillet over medium-high heat. Add the minced garlic and cook, stirring constantly for about 1 minute, or until fragrant. This step is crucial for infusing the oil with garlic flavor.
Add the ground beef to the skillet, breaking it apart with a spatula as it cooks. Cook for about 3-5 minutes or until the beef is browned. Be sure to drain any excess fat from the skillet to keep the dish lighter.
Pour in the soy sauce mixture and stir in the sliced green onions. Cook for an additional 2 minutes, allowing the flavors to meld together. Make sure everything is heated through.
Serve immediately, garnished with extra green onions and sesame seeds if desired. For added freshness, consider topping with a squeeze of lime juice before serving.
Notes
For freshness, consider topping with a squeeze of lime juice before serving.