Stardrop

The Stardrop is a mysterious fruit in Stardew Valley that permanently increases the energy of whoever eats it. There are several in the game: one costs 2,000 star tokens at the Stardew Valley Fair, one is in the chest on floor 100 of the Mines, Krobus sells one, the Secret Woods statue gives one for a Sweet Gem Berry, Willy mails one after the Master Angler achievement, one rewards a complete Museum collection, and a spouse at full hearts hands one over.