Heat a large, heavy-bottomed skillet over medium heat.
Add the ground beef, breaking it up with a wooden spoon, and cook until it is browned.
Drain off any excess grease, then add in the sesame oil, and toss to coat the beef.
Add the minced garlic and saute for 30-60 seconds, or until fragrant.
Then add the soy sauce, brown sugar, fish sauce (if using), ginger, and a pinch of red pepper flakes. Stir well to combine.
Simmer for 3-5 minutes to allow the flavors to combine, then remove from the heat.
Serve over rice, noodles, cauliflower rice, or in lettuce wraps. Garnish with chopped green onions and sesame seeds.
Notes
I recommend serving this with my easy Instant Pot White Rice - it's hands-off and ready in less than 20 minutes. Storage: Transfer to an airtight container and store in the fridge for up to 3-4 days, or in the freezer for up to 4 months. Ground turkey or chicken: Brown the meat with 2-3 tsp. of oil. Once cooked through, drain off the excess liquid and add the remaining ingredients. Gluten-free: Use tamari, gluten-free soy sauce, or coconut aminos.Without brown sugar: Substitute the brown sugar for a low-carb sweetener, coconut sugar, or maple syrup.