Peel and devein the prawns. Heat the oil in a medium pan. Add the onions and cook until soft. Add the garlic, chillies, turmeric and curry leaves. Stir over medium heat for 1 minute.
Add the coconut milk and salt. Simmer, uncovered, over low heat for 10 minutes.
Add the prawns and stir gently. Simmer for 12 minutes, or until the prawns are tender. Serve sprinkled with some fresh curry leaves, if desired.
