Kurins Tower
From VDragonball RPG Wiki
Senzu Beans are a kind of mystical bean in the Dragon Ball manga and anime series of immense rejuvenating properties. Senzu are grown by Korin in Korin Tower. When eaten, the consumer's energy and physical health are restored to their fullest; the effects are typicaly almost instantaneous for the recipient.
Senzu beans will restore after every 4 minutes if you're a V-Member and will restore after 30 minutes if not. Beans, beans, beans.