Wrap yam in a sheet of foil and place directly on BBQ grill. Cook on low heat until fork tender approx. 30min depending on size of yam. Set aside and allow to cool to the touch.
Brush cut pear sides with 2 tsp maple syrup and place directly on BBQ grill. Cook on low heat to caramelize until you develop grill marks 10min if pear is hard *Do not overcook or the pear will disintegrate.*
Place lime on grill cut side down. Grill for 5 min to achieve grill marks. Set aside to cool to touch
Prepare the Dressing:
Place the tahini, zest, pesto, garlic, olive oil, extra maple syrup, 1/4 tsp pepper and 1/2 tsp salt in a small ramekin. Squeeze the lime halves and stir to blend. Add 1 tbsp of water and stir together.
Peel skin of the yam. Slice into 1/2"-3/4" round slices, then cube the yam.
Dice the pear, removing seeds. Toss together.
Drizzle with dressing toss to coat. Can be served warm or room temperature. Readjust seasoning if needed.