1 small bunch fresh Thai basil, leaves (available from Asian supermarkets)
4 fresh coriander roots, crushed
1 small bunch fresh coriander, leaves
110g/4oz fresh galangal, peeled and sliced (available from Asian supermarkets)
6 sticks lemongrass, lightly crushed
1-2 limes, juice only
lime wedges
1 litre/2 pints chicken stock
75ml/3fl oz tamarind water (tamarind is available from Asian supermarkets. Soak the tamarind in hot water and push the pulp through a sieve to make tamarind water.)
75g/3oz palm sugar (available from Asian supermarkets), use brown sugar if unavailable
75ml/3fl oz fish sauce (nam pla), or to taste
8 tomatoes, cut into quarters, seeds removed
2 boneless skinless chicken breasts, cut into chunks
12 raw tiger prawns, shelled, gutted and split in half
6 lime leaves