After you're turned away at the Gerudo Palace, Dohna suggests you repair smaller rifts to prove yourself. One is south of Gerudo Town.

Where to Start the Quest

You can start the quest during A Rift in the Gerudo Desert after you visit Chief Seera in the palace in Gerudo Town. Leave the palace to get a message from Dohna, then talk to Dohna in the Oasis. Then go to the southwest location marked on the map and approach the soldiers to start the quest.

How to Complete the Quest

Go to the Smoothie Shop at the Oasis and approach the counter in the northwest part of the Oasis to make the Business Scrub pop out. Talk to the Business Scrub and make a smoothie using two Chilly Cacti. Then warp back to Gerudo Town and go south, and talk to Dohna. There will be a cutscene.