Place a medium to large frying pan on a medium to high heat and add the oil.
When the oil is hot add the mackerel fillets and cook for a few minutes on each side until the flesh turns opaque.
Remove the fillets from the pan, place them on a board and gently take off the skin with a knife. (note 2).
Cut the mackerel fillets into 2 cm / 1 inch chunks and set them aside.
Reduce the heat of the frying pan to medium, add the ginger and garlic and fry for two minutes until fragrant.
Add the yellow curry paste and cook for two more minutes.
Pour in the coconut milk, stir and add the turmeric.
If you are cooking your jasmine rice on the stovetop, put it on now and cook according to packet instructions. It should take around 10 minutes.
Add the fish sauce, kaffir lime leaves, sugar, red peppers, baby corn and mackerel pieces. Simmer for 5-10 minutes until the vegetables are tender.
Take the pan off the heat, stir in the lime juice and serve with jasmine rice and fresh coriander.