FISH FOOD: It’s a golden moment for Nobu Matsuhisa, who’s celebrating the fifth anniversary of his London restaurant and making his second screen appearance — in “Austin Powers in Goldmember,” which hits theaters July 26. Nobu, whose first role was in Martin Scorsese’s 1995 film “Casino,” plays the evil villain Mr. Roboto who spends his time slicing up fish. Roboto gets his just desserts, so to speak, when he’s fed to the sharks at the end of the film. “Actually, he should have been fed to the tunas, considering how much of them we use around here,” said Kurt Zdesar, general manager of Nobu London, after an anniversary dinner at the restaurant on Monday. Nobu, who was dressed in a new white chef’s coat designed by Giorgio Armani (his franchise partner in Milan), said he hoped the guests enjoyed their eight-course meal. “Next time, you all pay double,” he said with a smile.