For the curry paste, clean the chillies, cut lengthwise, remove seeds, wash and chop. Peel and chop turmeric and half ginger. Peel and finely dice shallot and garlic. Crush everything with cumin and some salt in a mortar to a paste.
Rinse chicken meat, dab dry and cut into bite-sized pieces. Peel the rest of the ginger and cut into fine strips.
Heat the oil in a wok or deep frying pan. Stir-fry the curry paste for 1-2 minutes. Add the chicken and star anise, stir-fry until brown. Add tomatoes and possibly 100 ml water, bring to the boil and simmer covered for about 15 minutes. Add lime juice and sugar. Season to taste with fish sauce. Add peanuts, simmer for another 5 minutes. Serve with ginger strips and Thai basil to taste. Serve with fragrant rice.