Chilled Herring Roe Mousse

Herring roes are inexpensive, widely available, quick to cook and highly nutritious. Whenever I cook them, I always think I should do so more often. They have long been a part of our gastronomic heritage, often used in savouries and breakfast dishes such as devilled herring roes, a simple dish in which the roe is fried in butter and spiced with cayenne or chilli and a little lemon juice, and served piled on toast.

On a recent visit to southern Spain, I came across a marvellous dish