I have to admit, I had never heard of Tennessee Onions. It appeared in my inbox, so I thought I would try it. It's very simple to make and could be a side dish to any kind of meat or used on a burger. You use sweet onion like Vidalia.u00a0Vidalia onions are a type of sweet onion. They have a mild flavor, and a relatively high sugar content. This would also be great to put on the grill.