I've got a 12 year old site with recipes (including vegetarian and vegan) and have had the daylights scrapped out of it - and I don't appreciate it. It's hurt me terribly because no one credits the source any more. And, it is humanely impossible to keep up with finding all the scraped content.
But the one good thing about recipes is that they're very difficult to claim any copyright on. Like someone said, alter them a bit - but remember that people may really try them; they should turn out good results. This would mean testing any alterations you make, which could be a job in itself.