Prep the chicken: Pat the chicken thighs dry with paper towels.
Dry skin sears and roasts better, giving you crisp edges and deeper flavor.
Make the marinade: In a bowl, whisk together tahini, lemon juice, lemon zest, olive oil, garlic, honey, cumin, paprika, coriander, salt, and pepper. Add 1–2 tablespoons of water until the mixture is smooth and pourable, like a thin yogurt.
Marinate: Add the chicken to a large bowl or zip-top bag. Pour in about two-thirds of the marinade and toss to coat.
Reserve the remaining marinade in the fridge for later. Let the chicken sit for at least 20 minutes, or refrigerate up to 8 hours.
Preheat the oven: Heat to 425°F (220°C). Line a sheet pan with foil or parchment for easy cleanup, and place a wire rack on top if you have one.
Arrange and roast: Place the chicken thighs skin-side up on the pan.
Spoon any excess marinade from the bowl over the thighs. Roast for 30–40 minutes, until the skin is browned and an instant-read thermometer reads 175–185°F in the thickest part.
Broil for crispness (optional): For extra color, broil for 2–3 minutes at the end. Watch closely to avoid burning.
Rest and finish: Let the chicken rest for 5 minutes.
Thin the reserved marinade with another splash of water if needed, then drizzle over the chicken. Top with chopped herbs and a squeeze of fresh lemon.
Serve: Pair with rice, couscous, roasted potatoes, or a simple chopped salad. The sauce is also great with charred broccoli, blistered tomatoes, or warm pita.