Preheat oven to 350℉ (180℃)
Prepare a 12-cup Bundt cake pan by spraying generously with baking spray. Alternatively, combine ¼ cup vegetable oil, ¼ cup flour and ¼ vegetable shortening. Using a pastry brush, apply generously to the Bundt cake pan.
In a large bowl combine flour, baking powder, cinnamon, ginger, cloves and salt. Set aside. (note: sift flour if necessary to remove any lumps)
3 cups All-purpose flour, 1 Tablespoon Baking powder, ½ teaspoon Salt, 1½ teaspoons Ground cinnamon, ½ teaspoon Ground ginger, ½ teaspoon Ground cloves
In a separate bowl, combine buttermilk, eggs, sour cream and oil. Set aside.
5 large Eggs, ¾ cup Sour cream, ¾ cup Buttermilk, ¼ cup Vegetable oil
Place butter and both sugars in a mixing bowl. Using a handheld or stand mixer, mix the butter and granulated sugar until light and fluffy (approximately 2 minutes)
¾ cup Granulated sugar, ⅔ cup Unsalted butter, ½ cup Brown sugar
Add ½ of the flour mixture and ½ of the buttermilk mixture to the bowl with the butter and sugars. Mix together until just combined, scraping sides and bottom of bowl as needed.
Add the remaining flour and buttermilk mixtures. Mix until just combined, scraping sides and bottom of bowl as needed.
Add macerated pears to the mixing bowl. Stir gently until pears are well distributed through the cake batter.
Add the batter to the prepared baking pan. Gently smooth the top with a spatula or the back of a spoon.
Bake for 45 - 50 minutes or until a toothpick inserted in the middle comes out clean. You may also check for doneness using an instant read thermometer. The internal temperature of the cake should be 180℉ (83℃). Note: if the cake top begins to turn too dark, place a sheet of aluminum foil over the cake and continue baking until done.
Allow cake to cool for 15 minutes then flip the cake over onto a cooling rack. Remove cake pan and allow to cool for another hour. After cooling, move cake onto a serving platter.