Cook the rice, as directed.
In a large skillet, brown the ground beef and drain, if needed.
In a small bowl, whisk together the beef stock, soy sauce, sesame oil, minced onion, garlic powder, ground ginger and salt and pepper. Pour over the browned ground beef, reduce heat to medium low and saute for 5 to 7 minutes.
Swirl the cornstarch with a tablespoon or two of water and stir it into the sauce. Let it simmer for 2 to 3 minutes to thicken the sauce. Garnish meat sauce with sliced green onions.
Prepare the salad.
Serve Korean Beef with Rice and side salad green onion garnish over rice with salad.