Step 1 : Introduction to the question "Which plant grows both tomatoes and potatoes?"
...Simply put, a TomTato plant's top portion is a cherry tomato plant while the bottom portion is white potato plant. The TomTato plant is a hybrid made by grafting the two plants together at the stem. The know-how to create such hybrids is nothing new but there's never been a huge demand for the fruit of these plants. The taste of the resulting tomatoes apparently falls flat of expectations. The potatoes produced are fine for boiling and mashing, however. Source: NewAtlas.com