Place the ground beef in a large bowl.
1 lb ground beef
Cut one half of the onion into ¼" thick half moons and set aside. Cut the other half of the onion into 4 or 5 large chunks. Put the large chunks into a blender.
1 onion
Add soy sauce, garlic, sesame oil, ginger, and pepper to the blender with the onion. Blend until smooth, about 30 seconds.
3 TBS soy sauce, 4 cloves garlic, ½ TBS sesame oil, ½ tsp ground ginger, ¼ tsp ground pepper
Pour the blended up onions over the ground beef. Mix into the beef using your hands until combined.
Heat a large skillet over medium high heat. Add the neutral oil and swirl to coat the bottom of the pan. Put the half of the onion that was cut into half moons in the pan. Sauté for 8 - 10 minutes, stirring often. You're trying to get good color on the onion but not burn it. If it starts to burn, turn down the heat.
1 TBS neutral oil
Add the beef to the pan and spread it into an even layer. Make sure the heat is at medium high. Let cook, undisturbed, for 3 minutes. After 3 minutes or so, break up the beef, stir it around a bit, then let it cook undisturbed for another few minutes. You want it to brown and caramelize.
Once cooked and browned, remove from the heat. Serve over rice and enjoy.