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1
Pulse cauliflower florets in food processor until rice-sized grains form (do not over-process into paste); transfer to colander and leave 5 minutes.
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2
Blanch cauliflower rice in salted boiling water for 2 minutes; drain thoroughly and spread on kitchen towel to cool completely and remove excess moisture.
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3
Combine cooled cauliflower rice with parsley, mint, tomato, red onion, and cucumber in large bowl; toss gently to combine.
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4
Whisk together olive oil, lemon juice, sumac, salt, black pepper, and cayenne in small bowl.
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5
Pour dressing over cauliflower mixture; fold gently until evenly coated; taste and adjust seasoning and acidity.
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6
Let rest 5 minutes; serve at room temperature or slightly chilled.