Sumac Chicken Thighs with Purple Cauliflower
To make ahead: Marinate chicken (Step 1) overnight
Tip: To make labneh, line a large sieve with 4 layers of cheesecloth. Set it over a deep bowl leaving at least 3 inches of space below it. Whisk 4 cups whole-milk plain yogurt with 1/4 tsp. salt; spoon into the cheesecloth. Refrigerate until at least 1 cup of liquid has drained out, 12 to 24 hours. (Discard liquid.) Refrigerate labneh for up to 1 week.