Multiples of:
1 diced leek
1 diced red onion
Equivalent of 2 "thumbs" of ginger in trimmings
Equivalent of 2 "thumbs" of galangal in trimmings
2 chopped shoots of lemon grass
2 lime leaves
4 crushed garlic cloves
2 litres of water
Boil and simmer for 30 minutes, then strain.
Peter Gordon