They're sort of like little meatballs, or dumplings, except that they're very small (edit: compared to genuine polpetti, which I like to make much larger) and can be made out of almost any meat there is. There's a place in Old Nice, near the Port, that served the fresh catch of the day (I remember a smothered salmon, which I then went back and cooked at my then-agent's Nice apartment), garnished with quenelles made of - wait for it - sardine and grey mullet, studded with slivers of truffle. I make mine, when I make them, by using a wide-tip plain oval tip on a pastry bag, and forcing them out that way. They're yummers.
wibble