Salvatore Calisi, former executive chef at Los Gatos’ excellent Dio Deka, has taken over the kitchen at San Jose’s Ristorante Fratello, a 10-year-old neighborhood Italian restaurant. He ditched every dish on the menu to create a totally new lineup. He also has plans to open a higher-profile Italian restaurant of his own in Los Gatos. Suddenly, it seems, Silicon Valley’s Italian food scene just got a whole lot better.