1. Use a pestle and mortar to crush the following

Coriander stalks, chopped

1 garlic clove, shopped

1/2 hot thai chili + red jalapeno (or red pepper) chopped fine 

2. Add the following to a saucepan and reduce over heat

4 tbsp sugar

4 tbsp white rice vinegar

4 tbsp fish sauce

6 tbsp water

3.  Add 1 to 2 and simmer 

then add the juice of 1 lime

Adjust as necessary