Place all ingredients except corn slurry mix into a small saucepan
Heat gently till bubbling. Simmer for 5 minutes until slightly reduced
Stir in cornflour slurry. Use some or all of it depending on how thick you want
Simmer for another 5-10 minutes until desired thickness
Add 1 tbsp sesame seeds if desired for chicken sauce
Discard the chillis before using.