Add ground sumac to a pitcher. Add water and stir well.
Refrigerate for 12-16 hours.
Pour the liquid into another pitcher through a nut milk bag, coffee filter, or a layered cheesecloth to remove solids.
Add a few ice cubes to tall serving glasses and pour the tea over the ice.
Add the sweetener of your choice and stir well.
Garnish with a mint sprig and serve immediately.
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