Cover Udon noddles with boiling water and heat according to packet instructions. Drain and set aside.
Heat one tbsp peanut oil in a wok over medium high heat.
Add beef strips and cook until browned.
Add cooking wine and continue cooking until wine has evaporated. Remove beef from wok and set aside.
Heat remaining peanut oil in wok, then add ginger, garlic & onion and cook for 1-2 minutes or until fragrant.
Return beef to wok and add hoisin sauce, soy sauce, tomato paste & chicken stock. Bring to boil then reduce heat and simmer for a few minutes to allow flavours to develop & sauce to thicken slightly.
Add noodles & tomato slices to wok and toss to mix through. Stir-fry until heated through.
Remove from heat, garnish with coriander and serve.