Several minutes into poring over our menus at Delarosa, my dining companion looked over at me and muttered, "This place is totally ripping Beretta off." That would be true if not for one important fact—Delarosa, which opened in mid-November on Chestnut street in the Marina—shares the same owners as Beretta, and ripping off is part of the plan. Consider for a moment the following: San Francisco can at times be a fractious town. Neighborhoods, like boroughs in New York, are clearly delineated, with crossover limited to a few choice restaurants. Marina folks aren't going to drive across town to wait on line at Beretta, and Beretta regulars won't brave Marina parking to try Delarosa.