Position a rack in the center of the oven and heat the oven to 350°F. Butter the bottom and sides of a 9x2-inch round cake pan (don't use a springform pan, as the caramel might leak out during baking). Line the bottom of the pan with a round of parchment and butter the top of the paper.
Make the topping
Peel, core, and cut the pears lengthwise into 1/4-inch-thick slices. Arrange the pear slices on the bottom of the pan in a circle around the edge, overlapping them slightly, with the pointed ends towards the center. If necessary, cut a little off the pointed ends to make the slices fit better. Or if the pear slices don't reach all the way to the middle, arrange a few of the shorter slices in the center to cover the bottom of the pan.
Make the Basic Caramel according to the directions. Immediately remove the pan from the heat and whisk in the 4 Tbs. of butter one piece at a time, until they are completely melted. Carefully pour the hot caramel evenly over the pears (it should spread over the pears and onto the bottom of the pan).
Make the cake batter
Sift the flour, baking powder, ginger, cinnamon, and salt into a medium bowl. Stir to combine. In a small bowl, stir together the milk and vanilla.
In the bowl of a stand mixer fitted with the paddle attachment, beat the butter on medium-high speed until light and fluffy, about 1 minute.Turn the mixer to medium and slowly add the brown sugar. Increase the speed to high and continue to mix until lightened in texture and color, 2 to 3 minutes total. Reduce the speed to medium and add the eggs one at a time, beating well after each addition and scraping down the sides of the bowl as needed.
Reduce the speed to low and alternate adding the flour mixture and milk mixture in five additions, beginning and ending with the flour. Mix each addition just enough to incorporate, as overmixing will lead to a tougher cake. Scrape down the sides of the bowl one last time and mix briefly to blend well.
Bake the cake
Spoon the batter in large dollops over the pears and smooth it into an even layer with an offset spatula. Bake the cake until the top is golden brown and a toothpick inserted in the center comes out clean, 35 to 45 minutes. Transfer the pan to a wire rack to cool for 10 minutes. Run a knife around the edge of the pan. Turn a cake plate upside down on top of the cake pan and, using pot holders, carefully invert the cake pan onto the plate.
nutrition information (per serving):
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Photo: Scott Phillips