OK, What's For Lunch or Tea Today?
If someone wants a foolproof, authentic and minimal way to do Tom Yum then you can build the individual ingredients into the serving bowl:
Fish sauce, start with 3 tablespoons
Lime juice, usually half a lime
A small red chilli with some perforations
A heaped teaspoon of Nam Prik Pao
Fresh torn coriander leaves
The broth consists of
Water
Bashed whole lemongrass
Thumb sized piece of galangal, sliced
Handful of Kaffir Lime leaves, at least six
I use the serving bowls (should be large!) to measure how much water I need.
Simmer the broth for 15 or so mins then strain it into a new pan. Add in loads of halved baby mushrooms, until they shrink, then in with raw king prawns and crank up the heat until the liquid starts bubbling. Immediately ladle into the bowls and give a good stir.
Now the important part: you need to taste the broth. You might want a touch more lime or a dash more fish sauce. This balance of sour and salty is the foundation of great Tom Yum. :)
Some people like to add shrimp heads into their broth, well if you have them go for it.