Optional Garnish: sliced green onion, toasted sesame seeds, crushed red pepper flakes
Optional, for serving: cooked rice
Instructions
In a large skillet, heat sesame oil over medium-high heat for about 1 minute.
Add beef, onion, garlic, and ginger to the skillet. Cook, breaking up the meat as you stir, until the beef is no longer pink and the onion is tender (about 5-7 minutes). Drain off excess grease.
Stir teriyaki sauce into the beef mixture. Bring to a low simmer and cook for an additional 3-5 minutes, just until the sauce thickens slightly.
Serve over rice, in tortillas, or in lettuce wraps. Garnish with optional toppings.
Notes
Pick a brand of teriyaki saucethat has a thick, rich consistency (rather than other varieties that have a thinner consistency that's similar to soy sauce). I like Soy Vay Veri Veri Teriyaki or this variety made by Kikkoman.