It looks like a mini calzone, but it's fried, not baked, so the outside turns blistered and crisp instead of soft and doughy.
Panzerotti are half-moons of pizza dough folded around tomato and mozzarella (or other fillings), sealed shut, and deep-fried until the crust puffs and crackles. Bari's street stalls and market fryers hand them over piping hot in paper.
Arancini (Fried Rice Balls)
Lampredotto
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Campari