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Heat oil in a medium frying pan or wok, then add the cumin seeds and garlic. Saute until fragrant, then add the chillies and fry for 1-2 minutes.
Add the sesame seeds and fry for another 30 seconds, then add the sesame oil, soy sauce, Chinkiang vinegar, sugar and salt, and stir well. Turn off the heat.
Let the dressing cool down and stir the chilli oil and coriander through when you’re ready to serve. This sauce will keep in the fridge in an airtight container for over a week without the fresh coriander