It was originally designed to preserve fish for weeks without refrigeration, which is why it still tastes better a day or two after it's made, not fresh.
Sarde in saor are fried sardines layered with softened onions, vinegar, pine nuts, and raisins, left to marinate so the sweet-sour flavors soak in. Venetian bacari serve small plates of it as a classic cicchetto with wine.
Arancini (Fried Rice Balls)
Lampredotto
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Campari