Combine sauce mix and set aside.
In a hot wok or pan, fry beef in a little oil in batches for 2 minutes or until just cooked and set aside.
In the same wok or pan, add more oil and stir fry vegetables for 1 – 2 minutes, add sauce and beef, mix through to coat all ingredients well. Toss thoroughly.
Garnish with sesame seeds and serve with steamed rice.