Polenta e Baccalà

Synonymous with peasant comfort food, this can often be found on winter Fridays in small towns, where there will probably be a street market. Baccalà is a preserved fish which used to be cheap food eaten in the valleys where supplies of fresh fish were hard to come by. But today it is eaten everywhere because of its remarkable taste, and it is more expensive than fresh cod. The recipe for salt cod I find most suitable for eating with polenta is