Prepare ingredients

1. Cut beef into strips.
2. In a bowl, mix together all ingredients for the marinade. Add beef strips and stir to ensure all the beef is coated thoroughly. Cover and let marinade in the fridge for 30 minutes.
3. Medium dice onion, cut broccolini into 2 inch pieces, and cut bell pepper into long thin strips.
4. In a small bowl, mix together all ingredients for the sauce.

Cook

1. In a large nonstick wok or large skillet, heat up 1 tsp oil over medium heat.
2. Add onion and stir fry until translucent.
3. Increase heat to high, then add marinated beef strips and stir-fry until just browned on the outside. It does not need to be completely cooked through yet. Remove beef from heat and set aside on a plate.
4. Reduce heat back to medium. Add broccolini, bell pepper and a splash of water. Cover with a lid and let steam for 1-2 minutes or until the vegetables are cooked to desired tenderness.
5. Stir the vegetables around to ensure all the water has evaporated. Add beef strips and sauce and quickly stir-fry until sauce has thickened slightly. Remove from heat and serve immediately.
6. Garnish with fresh cilantro and sesame seeds and serve with steamed rice. Enjoy!