Well, you learn from your mistakes, most of the time. I hope by me telling of this one someone else won't make this mistake. Ok. I like canned tomatoes and so i have canned juice and whole peeled tomatoes for several years now. have also canned fruit and fruit pie fillings. So i buy a large canner. I want to can hamburger in case electricity is turned off. I canned 10 lbs of hamburger with onions. I did that with success and let them sit. This past weekend I was sick and so thought I would try out one of the quart jars of my work. Well, I opened the can and was sadly met with the contents smelling like canned cat food. I tried using it but it was just too nasty. I work with a nice lady who discusses food topics with me and I told her of the situation. She said it was the onions. She has canned hamburger many times with great results. NO ONIONS. I love onions, I thought I was saving me some time and of course saving onion in my food stuffs at the same time. Boy was I wrong. Unless you like the flavor of cat food I guess you can can any thing you want or have the stomach for. Anyone else have such a situation?