Peel the butternut squash using a sharp vegetable peeler, then halve it lengthwise and scoop out the seeds with a paring knife. Arrange the halves cut side up on a parchment-lined baking sheet.
Brush the flesh of the squash with olive oil using a pastry brush, sprinkle with salt, and optionally add smoked paprika for extra warmth and depth.
Place the baking sheet in a preheated oven at 200°C (390°F) and roast for 40-45 minutes, until the edges are caramelized and the flesh is tender when pierced with a fork.
Remove the squash from the oven and let it cool for about 10 minutes. Once cool enough to handle, slice it into rustic, irregular chunks to keep the charming, homey look.
Meanwhile, prepare the lemon tahini drizzle by whisking together tahini, lemon juice or zest, and water until smooth and pourable. Adjust with more water if needed to reach your desired consistency.
Arrange the roasted chunks on a serving platter, then drizzle generously with the lemon tahini sauce. Garnish with chopped parsley or cilantro for a fresh, herbaceous finish.
Serve warm, perhaps with a side of grains or greens, or enjoy straight from the platter for a cozy, satisfying meal.