Partially fill a bowl with water and add lemon juice. Peel the pears and cut them into quarters. Chop 2 pears into a small dice & place the pieces in the lemon water. Slice each quarter of the 3rd pear in 4 long pieces. Place them in the water.
Heat oven to 350ºF. Coat a 9"-X-13" baking dish with cooking spray & dust lightly with flour.
Combine the oil, egg, buttermilk and molasses in medium bowl.
In a large bowl, whisk the flours, Splenda, baking powder & soda, salt, cinnamon, ground ginger & cloves. Add the wet ingredients & mix gently.
Drain the pears and set long slices aside. Stir the chopped pear pieces & the chopped ginger into the batter.
Pour batter into prepared pan. Arrange long pear slices on top & sprinkle with brown sugar.
Bake for 25 minutes. Serve warm or at room temperature.