Heat half oil in large frypan over high heat. Cook beef in batches until browned. Transfer to plate. Heat remaining oil. Add spring onions and zucchini. Stir-fry for 3-4 mins until softened. Return beef to pan and add marinade. Cook for 3 mins.

Place noodles in a bowl. Cover with boiling water. Set aside for 5 mins to soften. Drain. Add to stir-fry and toss. Sprinkle with sesame seeds and spring onions.