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Slice the onion: Use a sharp knife or mandoline to cut into paper-thin half-moons.
Optional soak: If raw onions feel too sharp, soak in cold water for 10–20 minutes. Drain and pat dry.
Scrunch (crucial step): Place onions in a bowl with salt and sumac. Gently massage with your hands for 1–2 minutes until softened and lightly pink.
Mix & marinate: Add parsley, lemon juice, and olive oil. Toss well to combine.
Rest: Let sit 15–30 minutes so flavors meld before serving. Bon appétit.