In a large bowl, mix the meat with the lemongrass, chilli pepper, garlic, ginger, and coriander root.
Preheat a wok at medium temperature and toss with 1 tablespoon of oil. Brown the cashew nuts lightly for 1 minute. Remove from the wok and drain.
Heat the rest of the oil in the wok. Fry the meat in portions over a medium heat for 4-5 minutes. Put all the meat back into the wok.
Add lime juice, fish sauce, palm sugar and basil and heat for 30-60 seconds until the basil just crumbles. Add the cornstarch and reduce the resulting sauce while stirring. Add the cashew nuts.
Serve with rice or Asian noodles.
TIP: (I read in my herbalism book)
If you can`t get fresh Thai basil, normal basil and some fresh mint will do.