The Grapevine is a food COB that injects near the Creatures 1 watchtower, opposite the waterfall. It was made by Stefan Kuske and can be downloaded from Albian Critter Litter.
From the readme:
The sweet fruit of the grape for your norns. The grapevine is located near the light house. If a norn eats a grape, it has the following results to the norn:
- Hunger: -100
- Tiredness: -40
- Need for pleasure: -50
- Vitamin C: +90