Pour the coconut milk and 400ml/14fl oz cold water into the casserole. Add the lime leaves, cinnamon stick, sugar, tamarind paste or lime juice, soy sauce and salt and bring to a simmer.

Stir in the curry powder and cook for a further 30-40 seconds. Add the lentils, coconut milk, 400ml/14fl oz water and half a teaspoon of salt to the onion and garlic mixture, then bring it to the ...