Fresh sardines are only sporadically available, so we’ve recommended using canned sardines here. By all means broil fresh sardines if your fishmonger has them. If you go with canned, spend a little money on them: Imported Portuguese and Spanish sardines such as Cole’s and Matiz taste much better than the grocery store staples. You could also use good-quality tuna—again, imported canned tuna, or line-caught albacore from the Western U.S., will taste best. A time-saving tip: Soaking the farro overnight (or at least during the day while you are at work) will give you a running start with this dish.