Grilled Cauliflower Salad with Tahini Yoghurt Sauce

Special equipment: a grill, grill basket (optional)

1. Preheat a grill to medium-high.
2. Combine 3 tablespoons of the olive oil, 2 teaspoons of the sumac and the cumin and turmeric in a large bowl. Add the cauliflower florets and toss with the spice mix until fully coated. 
3. Place a grill basket or a 12-by-18-inch piece of tinfoil on the grill, then add the cauliflower in a single layer. Close the lid and grill for 15 minutes. Open the lid and flip the florets with a pair of tongs. Close the lid and grill until the cauliflower is charred in spots and crisp tender, 10 to 15 minutes more.
4. Meanwhile, whisk together the yogurt, tahini, lemon juice, garlic, remaining 1 tablespoon olive oil, remaining 1 teaspoon sumac, 1/2 teaspoon salt, 1/4 teaspoon pepper and 3 tablespoons water in a small bowl. Set the tahini yogurt sauce aside.
5. Transfer the grilled cauliflower to a large serving plate and season with salt. Top with the mint, parsley, green onions, red onions, walnuts and sultanas, then drizzle with the tahini yogurt sauce (see Cook’s Note). Serve warm or at room temperature.

Cook’s Note

If you’re not planning to serve the salad immediately, dress it right before serving.