On extreamly heated wok add oil and onion and toss it.

In one bowl mix chilli sauce, soya sauce, chilli vinegar and sugar together.

Add green chilli and garlic in wok and again toss it till garlic gets little brown.

Add noodle and mix it. Later add sauce mixture and green onion and let it cook for 2-3 mins. Stir it continuously. Add salt here in case if its needed