1. Preheat oven to 400°.
2. Arrange squash, cut sides up, on a parchment-lined baking sheet. Coat squash lightly with cooking spray; sprinkle evenly with salt. Combine syrup, butter, 1 tablespoon water, and harissa in a bowl, stirring well; drizzle evenly into each squash cavity. Bake at 400° for 30 minutes. Sprinkle squash evenly with sesame seeds; bake 20 minutes or until seeds are toasted and squash is tender.