Monkfish
From Cookipedia
Monkfish taste wonderful, but in their native state look pretty vile. In Spain they are often sold whole, but in the UK you are only likely to see the tails, filleted and skinned.
Monkfish can be quite a good substitute for prawns, although it's probably more expensive.
Not surprisingly, Monkfish salsa verde goes well with monkfish!
Seasonal Information: Monkfish
This information is specifically for countries in the northern temperate zone of the Northern Hemisphere; particularly the United Kingdom, however it should be applicable for northern USA, northern Europe, Canada, Russia, etc.
Monkfish is at its best and in season during the following months: August, September, October, November, December & January.