I love this. This is so interesting and fun. As a gardener, my first thought was that I have to try this. Has anyone ever heard of this? I have heard about grafting but grafting potatoes and tomatoes??? http://homestead-and-survival.com/how-to-grow-tomatoes-and-potatoes-on-the-same-plant/ Here are the specific instructions to do it yourself: How to Graft a Potato & Tomato Plant Together Here is a history on Ketchup 'n' Fries. You can but the plants already started but learning to graft successfully is a great skill. A plant that grows both tomatoes and potatoes? Meet the Ketchup 'n' Fries hybrid now for sale in the U.S.