As you seen in the picture, a tomato that has entered the vivipanic phase, that is when the germination of its seeds begins to occur within the pericarp under favorable conditions. The nutrients that these seeds receive come from the same fruit…

pericarp [ˈpɛrɪkɑːp] is a Noun word, and botanically it is defined as: The part of a fruit formed from the wall of the ripened ovary.

Viviparity

Among animals, viviparity is development of the embryo inside the body of the parent. This is opposed to oviparity which is a reproductive mode in which females lay developing eggs that complete their development and hatch externally from the mother.