Cheats' Goan mackerel curry
Cook off the curry paste in a pan with the oil.
Throw in the mackerel steaks and completely cover with paste.
Add the coriander stalks to the pan with the red onion and cook for a moment or two.
Add the lime zest and juice and the coconut milk.
On a medium heat, simmer for 15 minutes, turning the mackerel a few times.
Serve with rice.