Soak the Dried shiitake mushroom in hot water until softened, then drain and slice.
Cook the Sweet potato starch noodles according to the packet instructions. Drain well and set aside.
Cut the Beef into thin strips.
Cut the Carrot and Red pepper into matchsticks and prepare the White onion, Garlic and Spring onion.
Beat the Egg in a small bowl.
Heat a non-stick pan over medium heat and cook the Egg into a thin omelette. Allow to cool, roll tightly and slice into thin strips.
Heat the Vegetable oil in a wok or large pan over high heat.
Add the Beef and cook for 1 minute.
Add the Garlic, White onion, Carrot, Red pepper and Dried shiitake mushroom. Stir-fry for 2–3 minutes until just tender.
Add the Sweet potato starch noodles and the Sauce. Toss well until evenly coated.
Fold through the Egg strips.