Well its more of a roulade, but sausage seems like a better word.
You need a food processor for this one.
Firstly get 300g of green prawns with no shell, rough chop them and throw them in the food processor with a good pinch of salt, some lemon zest and turn it one for about 30 secs. then add and egg white and slowly add 150ml of runny cream slowly as well all whilst the processor is turned on.
Scrap this mixture into a bowl and mix through some fine chopped parsley.
This next trick is a must or it wont work. Get out the cling wrap and roll out around 30cm.. double then triple it over so you have a 30cm piece of clingwrap 3 layers deep (takes 10 secs)
get out a piece of fish and place it on one side of the clingwrap and fold the other side on top of it.. Use a meat mallot, very carefully beat the fish till it is a few mm thick all over.
spread the prawn mixture evenly over the top of the fish (mixture should be enough for a few of these) Loosely roll the fish into a "sausage" Get out the alfoil and tear of a good sheet. Spray it with cooking oil or use butter place the fish ontop and roll it up. While rolling hold the tag ends of the foil and roll it back n forth and it will turn into a perfect cylinder. Put it on a baking tray with a bit of water and bake at 180 for 15 minutes..
When you unwrap it the prawn mix (called moussaline) will hold everything together and it tastes bloody good.
Serve with white wine sauce or mayonnaise and is also good cold cut into slice on a sandwich with lettuce..
Sounds a bit harder than it actually is to make