In the case of some ingredients, it takes just a smidgen to add flavor to a dish, and truffle butter is one of them. Reader Stephen Najmowski, who’s looking for truffle butter, can get both white and black truffle butters locally. Jackie Raim emailed that Whole Foods Market carries both versions, and the Jensens at Village Meat and Wine, 5025 S. Eastern Ave., and Ron Lutz of The Butcher Block, 7625 S. Rainbow Blvd., said they do as well. ...