Preheat oven to 375 degrees.
Combine water, lemon juice and brown sugar in a bowl and set aside.
Place pear halves, cut side up on a foil-lined baking sheet and begin baking for about 40 minutes. Baste with lemon mixture every 10 minutes. Remove from oven once pears are fork tender. Let cool 5 minutes before serving or refrigerate overnight for use the following morning.
To serve, spoon yogurt into pear cavities then sprinkle with granola.