If the “Good Will Hunting” boys were from Southie today, they’d probably be hipsters. The Waterfront and Leather District areas of South Boston are home to some of Boston’s most expensive restaurants and bars. One such restaurant in the nine-block Leather District is O Ya, whose creative omakase take on sushi and sashimi runs upwards of $200. O Ya doesn’t serve traditional, purist sushi, but instead plays with things like banana pepper mousse on top of nigiri and traditional Japanese sauce garnishes (think moromi, the unfiltered fermentation product of sake brewing). Don’t miss the foie gras nigiri, dressed with chocolate kabayaki sauce and paired with a sip of beautiful aged sake, and the excellent wagyu steak.