Cook the beef. Season steak strips with salt and pepper; add to wok. Cook for 3 to 4 minutes or until browned on all sides, stirring frequently.
In the meantime, prepare the sauce. In a mixing bowl, whisk together lime juice, ground ginger, soy sauce, and sugar; whisk until well combined. Remove the wok from the heat and stir in the prepared sauce. Transfer the steak to a plate.
Cook the veggies. Wash or wipe down the wok. Heat the remaining canola oil in the wok. Add frozen veggies; cook for 5 minutes, stirring frequently.
Put it all together. Stir in previously prepared steak and cook for 2 minutes, or until heated through. Remove from heat; drizzle with lime juice.
Serve. Garnish with onions, sesame seeds, and crushed red pepper, and enjoy the beef stir fry over rice or noodles.