I'm making cumin-scented quinoa with shredded beets and the recipe calls for a sumac-yogurt topping plus sumac in the quinoa
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hardlikearmour is a trusted home cook.
sumac adds a tart note, so I'd sub with a little lemon juice and zest
SInce Sumac adds a bit of a lemony taste to many Middle eastern recipes, I would try a bit of Lemon zest.
Monita is a Recipe Tester for Food52
If you have Zaatar, another Mideastern spice, it contains Sumac and would add a nice flavor
If you can get pomegranate molasses, that would be v nice here!