Rob: Artificial - yes, you mean is it man-made and trying to copy something that is natural? Well, in a way - yes. Because scientists have developed a genetically modified purple tomato; they took red tomato plants and changed their genetic patterns so that they now produce new, purple tomatoes.
Finn: Yes, so this would be an example of GM - genetically modified - food. It's something we'll be discussing more soon and, of course, looking at some related vocabulary.