Now add all the other ingredients except the spring onions and the cornflour mixture. Bring it to a boil, simmer for another 2 minutes, then stir in the cornflour slurry and mix well. The sauce should thicken in about 10 seconds. Taste for the flavour balance, adding either sugar (more sweetness), orange/lemon juice (more tartness), or light soy sauce (more saltiness) as required.
Quickly add the spring onions, stir once, and serve on to a warm plate.
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