Boil noodles in six to eight cups of salted water to which one tablespoon of oil has been added and cook till almost done. Drain, refresh in cold water, drain again and spread on a large plate to cool. Heat sufficient oil in a wok and deep-fry noodles till crisp and golden brown in colour. Drain and place on absorbent paper. When cool lightly crush the fried noodles and set aside. In a large bowl combine fried noodles, spring onions, bean sprouts and peanuts and toss to mix well. Add Sichuan sauce and tomato ketchup and toss the mixture again. Adjust seasoning. Transfer this mixture into individual plates and serve garnished with spring onion greens.