I loved their recipe but it's even better with our maple syrup!
Peel the sweet potato, then chop it into 1/2 inch cubes, roughly.
Place the sweet potato in a steamer basket above 1-2 inches of water, and steam, covered, for 15-20 minutes, or until very tender.
Transfer the cooked sweet potato to a mixing bowl, then mash with a potato masher or fork.
Stir in butter and maple syrup, then serve.