CNN  —  The best pizza in the United States comes from a wood-fired oven on New York’s Lower East Side, an Italian pizza-ranking guide has announced. For the second year running, the Naples-based 50 Top Pizza judged Una Pizza Napoletana the winner in its annual assessment of American bakers. The ranking focuses strictly on Neapolitan-style pizza — the thin, round, fastidiously prepared variety from the city that considers itself the cradle of pizza — but to aficionados, it’s the only type that