Make sure you have some extra palm sugar, lime juice and soy sauce available.
Mix all the ingredients together in a small pan, bring to the boil for a minute or so.
Reduce the heat and gently simmer until the sugar has melted.
Taste and adjust the seasoning.
The sauce should have a distinct blend of salty, sour, sweet and spicy.
This is very personal, so add a little more of any or all the ingredients to get it just right.
I usually remove the cooked chilli, finely chop, and add it back into the sauce.
Store it in the fridge.
Make sure you have some extra palm sugar, lime juice and soy sauce available.