The Wonders of Chuchu Jelly
The quest is unlocked after completing The Great Plateau scenario.
"Evidently, that little trickle of liquid that comes out of squashed white Chuchu jellies has cooling properties. Maybe the Gerudo could use this to beat the heat."
"You gave a little white Chuchu jelly to everyone in Gerudo Town. Grateful and much more comfortable, the local vai banded together to build a new road, improving relations with other regions."