Preheat the oven to 375°F. Lightly oil a 10-inch cake pan. Line the pan with parchment paper and lightly oil the paper.

In a medium bowl, combine the flour, sugar, cocoa, baking soda, baking powder, and salt.

In large bowl, whisk together the eggs, coffee, buttermilk, oil, and vanilla extract. Gradually stir the flour mixture into the egg mixture. Mix until thoroughly blended.

Line the bottom of the cake pan with the pears in a circular design. Pour the batter on top of the pears. Bake for 55 minutes, or until a wooden pick inserted in the center comes out clean.

Place on a rack and let sit for 10 minutes. Run a metal spatula around the sides of the cake to loosen them. Invert the pan onto a plate. Using the handle of a knife, vigorously tap the top of the pan, even shaking it a bit, to loosen the cake. Leave the pan over the cake for 15 minutes. Remove the pan and let the cake cool completely.