Peel the pears; cut them in half, then remove the cores.
Grease a baking dish with butter. Place the pears in the dish cut side down; then squeeze with the lemon juice. Pour the water around the pears and place small chunks of the butter or coconut oil around the dish. Drizzle with 1 1/2 tablespoons maple syrup and sprinkle with the Chinese five-spice powder.
Bake uncovered, brushing frequently with pan juices, until the pears are tender and golden brown, 15 to 20 minutes. (The exact timing depends on the ripeness of the pears; if they’re still not fork tender, bake them a little longer!)
While the pears roast, prepare the Greek yogurt and almonds: In a small bowl, mix the Greek yogurt with the remaining 1 tablespoon maple syrup and the vanilla. In a dry pan over medium heat, heat the almonds, stirring occasionally, until browned – about 3 to 4 minutes (make sure to watch them constantly so they do not burn).
To serve, place 2 roasted pear halves on a plate. Garnish with a dollop of vanilla Greek yogurt and toasted almonds.