Pound the bird’s eye chillies and turmeric to a paste. Put paste in a pot together with coconut milk and pineapple. Bring to the boil and simmer for 15 minutes.
Add dried sour fruit, sugar, salt and turmeric leaves.
When gravy comes to the boil, put in the crabs and cook for a further 5 minutes until crabs are done. Season with more salt and sugar to ta