Place the asparagus on a baking sheet. Drizzle with olive oil, and sprinkle with salt and black pepper. Toss to coat.
Roast in the preheated oven for 10 minutes, or until tender.
While the asparagus is roasting, prepare the dressing. In a mixing bowl, whisk together tahini, maple syrup, lemon juice, minced garlic, and water until smooth.
Remove the asparagus from the oven and transfer to a serving platter. Drizzle with the maple tahini dressing.