Lamb barbecue is mildly popular in northern Japan, but it’s not slated to make a January appearance at O-Ku, the only Indigo Restaurant Group property sitting out a month-long lamb bonanza. In partnership with the American Lamb Board, Oak Steakhouse, The Macintosh, The Cocktail Club and Indaco are putting sheep-based dishes on their menus, and providing tie-in recipe cards to interested patrons. “Charleston is known for pork and seafood but we wanted to help these restaurants go on the lamb,” a press release quotes the American Lamb Board’s executive director as saying. Planned dishes include roasted leg of lamb and lamb Bolognese cannelloni at Indaco and braised lamb neck ravioli at The Macintosh. Whether or not Charlestonians order lamb with abandon, the restaurants can count on strong sales toward the end of the month, when the American Sheep Industry Association holds its annual convention at the Charleston Marriott.