Frank Castronovo and Frank Falcinelli, who own two well-established Italian restaurants in Brooklyn and Manhattan, have been planning to open a slice shop since last September. This September, they say, the pizzeria will finally open in a space between Frankies 457 Spuntino and Franks Wine Bar on Court Street in Carroll Gardens, Brooklyn. They are tentatively calling it F & F Pizzeria. What took them so long?

“You need an expert. We’re not pizzaiolos,” Mr. Castronovo, 51, said with a shrug, in his office over Frankies 457 Spuntino, the restaurant he has owned with Mr. Falcinelli, 53, since 2004. “It wasn’t until we actually decided that we would do pizza that we realized that we needed to work with somebody, collaborate with somebody.”