Kozu, a restaurant that offers Japanese cuisine and sushi with Peruvian influences, has been opened in Southampton by Zach Erdem, the restaurateur behind 75 Main. The head chef, John Keller, is formerly of Nobu; the sous chef, George Nikolopolous, worked at Le Bernardin, and the sushi chef, Joseph Kim, is formerly of Morimoto. The second annual Food Lab conference will take place tomorrow through Sunday at Stony Brook Southampton, sponsored by Slow Food East End.