Can't claim copyright on a recipe
As far as I understand, facts themseleves can't be copyrighted. In fact, I'm pretty sure that Trivial Pursuit got away with ripping off a book of facts for their questions for that exact reason. Cracked has an article on it http://www.cracked.com/article_18995_5-classic-board-games-with-disturbing-origin-stories_p2.html
Similarly, recipes can't be copyrighted, as far as the ingredients and steps to create the dish go. Any flavour text, related commentary, or photographs can certainly be copyrighted, but there's nothing stopping me reproducing a recipe from a famous chef in basic terms without having to ask first or having to give any kind of acknowledgment.