These can be made from a variety of different raw fish: white fish such as cod or hake, or oily fish such as mackerel or salmon. A mixture of fresh and smoked fish is also good, and the fish can he coarsely flaked or finely minced, whichever you prefer.
Leftover cooked fish can also be used in fish cakes, using equal quantities of fish and potatoes.
Flake raw fish with a fork. Mix with mashed potato and enough egg to bind, using a spatula. Add chopped parsley and seasonings and blend into the mixture.
Roll up the prawns in blanched spinach leaves and place on top of the plain mousse in three rows.