Lava Juice

Lava Juice is a quest item that appears in Oracle of Ages. It is won by getting a score of 100 or higher in the Goron Shooting Gallery. It must be given to a certain Goron in a cave on Rolling Ridge in the past. Said Goron, who is an acquaintance of the Graceful Goron, will then give Link the Letter of Introduction. After showing the letter to the Graceful Goron, he will give Link the Mermaid Key, but only if Link can successfully complete the Goron Dance.