Add the spices and continue to cook for a further minute or until you can really smell them, then add the ginger and chillies and stir over the heat for a further minute.
Pour in the coconut milk, tamarind paste and 400ml of water (use the empty coconut milk tin to measure the 400ml). Season with salt and pepper, stir well and bring to a simmer.
Once the sauce is simmering, add the aubergine and continue to cook for 5 minutes, then add the carrots and simmer for 10–15 minutes, until the carrots and aubergine are tender and the sauce has thickened a little.
Add the green beans and cook for a further 3 minutes, then add the fish. Stir well to coat, then cook for 3–4 minutes, until the fish is just cooked through. Taste and adjust the seasoning as necessary.
Serve the curry with rice in warmed serving bowls, sprinkled with toasted desiccated coconut, if using.