Super-Simple, Super-Spicy Mongolian Beef

Whisk together soy sauce hoisin sauce sesame oil sugar garlic and red pepper flakes in a bowl. Toss beef with marinade cover and refrigerate 1 hour to overnight.

Heat peanut oil in a wok or large nonstick skillet over high heat. Add the green onions and cook for 5 to 10 seconds before stirring in the beef. Cook and stir until the beef is no longer pink and is beginning to brown about 5 minutes.