Place all ingredients except cornflour and fish sauce into TM bowl and puree 20 sec/speed 8.
Scrape sides of bowl (beware of chilli fumes) and cook 12 min/90ºC/speed 1.
Add cornflour and cook 3 min/90ºC/speed 1.
Add fish sauce and mix 5 sec/speed 3.
Pour sauce into clean glass bottle and cool before sealing and storing in the fridge.
This sauce can create strong vapours while cooking, so it is recommended the cooking area be well ventilated by opening a window or turning on an extraction fan.