Trout with polenta is a "piatto unico" - a one dish meal (in the sense that it is all served on the same plate rather than in a series of courses as is more common in Italy). This dish is also happily eaten by babies with a spoon (check for bones first). The tangy tomato sauce contrasts nicely with the creamy polenta and gives the feeling of a cosy, filling winter meal (but without the typical calories or fat). Salmon can easily be substituted if that is more readily available.