Cut the beef into thin slices, 2 inches long. Put in a bowl and add the marinade and leave for 30 minutes. Heat a wok over a high heat until very hot and then add 2tbsp of groundnut oil. When slightly smoking, add the beef from the marinade. Stir-fry for 3-5 minutes, until browned. Remove and drain on kitchen roll.
Wipe the wok clean and add the remaining 1 tbsp of groundnut oil. Heat the oil and then add the ginger, shallots and garlic and stir-fry for 20 seconds. Add the peppers, soy sauce, dry sherry, salt, pepper and sugar and stir-fry for 2-3 minutes.
Return the beef to the wok and stir-fry for 3-4 minutes. Serve with fresh basil and an egg noodle stir fry.
For top tips on protecting you and your family when preparing raw meat and poultry, visit Food Safety in the Home and view the full Food safety at home video.