1. Place the steak on a flat surface and, using a sharp knife, cut against the grain into slices about 2-in. Wide. Slice each piece of steak horizontally into 2 or 3 pieces. Stack the slices and cut into 1/4-in. Strips. 2. Add the cornstrach to the steak and toss to coat. Place the steak in a bowl and sprinkle over the sugar and soy sauce. Set aside. 3. Heat 2 tbsp oil in a wok or large skillet and add the cauliflower, green pepper and carrot. Cook, stirring, until crisp-tender. 4. Add the mushrooms and cook, stirring, about 30 sec. Longer. Add the bean sprouts and stir-fry for a few sec. Longer. 5. Remove the vegetables with a slotted spoon and set aside. 6. Add the remaining oil to the wok or skillet. When it is very hot, add the ginger and garlic and cook, stirring, for a few sec. Add the steak and cook, shaking the wok and stirring the strips of steak to separate them and cook evenly, about 1-2 min. 7. Return the vegetables to the wok and toss quickly over high heat, then serve.