The effort required for validating them. Pharmaceutical compounds can reach into the hundreds of millions of dollars just for the clinical trials and certifications of production steps, and on top of that comes the cost to failed attempts which are rolled into the pricing of products that do make the cut.
A cooking recipe however, unless you're dealing with stuff like fugu fish, will not kill or injure those who replicate and eat it, and there's no regulatory hurdles to pass.
How is it possible that this can be patented, but ordinary recipes can't? Everything is "industrial" if done in a scale large enough
(note: the excerpt from the comment above this chain was about copyright, not patents)
Either this or processes to prepare food shouldn't be patented at all