This recipe follows in the tradition of the sweet and sour sardines and is vivid yellow in colour from the use of saffron. The original recipe, ‘A sweet and sour dish of whichever fish you want’, comes from Libro per Cuoco by the Anonimo Veneziano: ‘Take the fish and fry it. Take onions, which have been boiled a little and chopped finely, and fry them well. Then take vinegar and water and whole peeled almonds, currants, strong spices and a little honey and put everything to boil together (with the onions) and put it above the (fried) fish.’
The clever crew at restaurant Bistrot di Venise have taken that brief description and worked it up into a really splendid first course where piles of soft, saffron-yellow onions sit atop delicate sole and fat pink prawns.