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Published 07:50 4 Jul 2017 BST

He explained that the skin of the tomato keeps the tomato juicy. By keeping on the stem, or leaving the stem side open to air, it allows those juices to evaporate and the tomato to become wrinkled.
Here he is to explain further:
https://www.youtube.com/watch?v=4OIQ0vQEfOo