Place the curry paste, curry powder and dark soy sauce in a bowl and mix together. Cut the pork into bite size pieces and add to the mixture and combine. Cover and marinade for 30 minutes.
To cook, heat the oil in a large pan, add the ginger and garlic and stir through, cook for 1 minute. Add the pork and stir through, continue cooking until it loses that raw look. Add enough stock or water to cover the meat. Bring to the boil and then reduce to a simmer. Stir in the tamarind, sugar and fish sauce. Cook for 1 hour, a little more if needed. Finish with the ginger and basil leaves
To finish