Heat the fat from the coconut milk, which will settle in the top of the tin, in a pan and add the Red Thai curry paste Heat in it. Fry the paste over a medium heat for 1 to 2 minutes until well dissolved.
Add the remaining coconut milk, palm sugar and a few tablespoons of fish sauce and heat together. The red Thai curry should taste spicy hot and slightly sweet.
Cut off the heads of the fish and divide the body lengthways into four equal pieces.
Cook the fish pieces together with the peas and aubergines in the curry sauce for 10 to 15 minutes. Season to taste again at the end.
Serve the curry in a bowl and garnish with fresh Thai basil. Serve with steamed Jasmine rice serve.