Mince the chicken with the salt and garlic, if using.
If using offal, wash in salted and acidulated water to clean and remove coarseness, then finely slice.
Heat stock and season with salt and sugar.
Add the mince and offal, if using, and simmer, stirring often, until just cooked (about 3-4 minutes); do not overcook or the meat will toughen.
Season with lime juice, roasted chilli powder and fish sauce.
Mix in shallots and herbs.
Check the seasoning – the salad should taste hot, sour and salty – and adjust the seasoning accordingly.
Sprinkle with roasted rice.
Serve with a plate of raw vegetables such as cabbage, snake beans and cucumber.