1. FOR THE SQUASH: Adjust oven rack to lowest position and heat oven to 425°F. Using sharp vegetable peeler or chefs knife, remove skin and fibrous threads from squash just below skin (peel until squash is completely orange with no white flesh remaining, roughly 1/8 inch deep). Halve squash lengthwise and scrape out seeds. Place squash, cut side down, on cutting board and slice crosswise 1/2 inch thick.

2. Toss squash with melted butter, salt, and pepper until evenly coated. Arrange squash on rimmed baking sheet in single layer. Roast squash until side touching sheet toward back of oven is well browned, 25 to 30 minutes. Rotate sheet and continue to bake until side touching sheet toward back of oven is well browned, 6 to 10 minutes. Remove squash from oven and use metal spatula to flip each piece. Continue to roast until squash is very tender and side touching sheet is browned, 10 to 15 minutes longer.

3. FOR THE TOPPING: While squash roasts, whisk yogurt, oil, water, and pinch salt together in small bowl. Combine sesame seeds, coriander seeds, thyme, and pinch salt in second small bowl.

4. Transfer squash to large serving platter. Drizzle yogurt mixture evenly over squash and sprinkle evenly with sesame seed mixture. Sprinkle with cilantro and serve.

Serves 4 to 6