Combine pears and lemon juice in a mixing bowl and toss to combine.
Heat a large skillet over high heat. When hot, add the butter. Add the pears and cook, stirring occasionally, until golden brown around the edges, 3 to 4 minutes. Add the cinnamon and allspice and toss to combine. Add the light brown sugar and cook, stirring occasionally, until pears are soft and the juices have blended with the sugar to form a sugary syrup, 2 to 3 minutes. Remove from the heat.
Parfaits may be assembled while pears are still warm or after they have cooled:
Place 2 tablespoons of the granola in the bottom of each of 4 parfait glasses. Add 1/3 cup of the yogurt to each glass, then divide the caramelized pears evenly among the glasses. Top each with 2 tablespoons of the remaining granola, then top each with 1 tablespoon of the ginger.
Yield: 4 servings