Patenting the recipe protects the actual description of the recipe, it does not prevent people from replicating the same dish, following the recipe, etc. Copyright registration protects the creative expression of the author from being co-opted by another. The registration protects the actual words in the recipe; it does not prevent others from following the recipe, even for commercial purposes. Third parties simply could not replicate the language of the copyrighted recipe (without permission) in their own writings, presentations, etc.
sounds unlikely to me, a patent on a recipe. are there examples of this?