A short quest where you need to deal with 2 groups of individuals fighting in Mt. Mingyuan. After you start the quest, keep following the quest navigation and you're good to go.
How to Start The Dealing Sands Quest in Genshin Impact
Teleport to Mt. Mingyuan south waypoint and head west to see a group of NPCs fighting. Defeat those with red HP bars to start the quest.
After that, go to the beach beneath the cliff to fight the group of Treasure Hoarders. You will then complete the quest. Yup, that's all. This is just as short as the Chili Con Cloudy quest.