I don't think that a small amount of onion in a recipe would be a problem. I think the article is talking about eating quite a bit of onion at one time. As I was reading this article, I thought of a dog that my mother-in-law used to have. She was a miniature pinscher and would sit at my mother-in-law's feet as she would be preparing dinner, peeling potatoes, etc. If anything would accidentally fall on the floor it would be eaten so quickly that I doubt that she even knew what she was eating. I have an image in my mind now of what would have happened if an onion had ever fallen on the floor. I can only imagine that she would have taken care of it in mid air!! Glad that never happened!