This smoked trout mousse can be served as an elegant starter or it’s perfect for a light lunch. It can be made with smoked mackerel which is much more economical (and has a stronger flavour) but for a special occasion, the trout is lovely. It’s a handy recipe to have as you can make it a few days ahead, indeed the flavour develops so this is preferable anyway or you can freeze it. Serve with warm melba toasts. Splendid.