With a spatula or your fingers, thoroughly butter a 10-inch springform pan. Sprinkle the pan with 2 tablespoons of the sugar to evenly coat the bottom and the sides of the pan. You will have to shake it a couple of times.
Whisk together one cup of sugar with the flour, baking powder, salt, eggs, heavy cream, dark rum, and vanilla in a large bowl. Do not over-whisk.
Gently fold the sliced pears into the batter, and, with the help of a wooden spoon, coat all the pear slices.
Pour the mixture into the prepared pan, and ensure the pears are evenly distributed and covered with the batter. Sprinkle over the remaining one tablespoon of sugar over the top.
Place the pan over a baking sheet covered with parchment paper and bake until the top is golden and firm to the touch, about 1 hour and 20 minutes.
Remove from the oven and place the pan over a cooling wire rack for about 5 minutes. With a sharp knife run it alongside the inner of the springform pan to ensure that the cake separates from the walls and comes out easily.
Remove the pan's side and serve your pear cake at room temperature.
Avoid overmixing the batter. Overmixing can lead to having a dry or tough cake.
Do not use canned pears, as they are flavorless and will not yield the same results.
Use a spring form pan because it makes getting the cake out smoothly easier.
Because your mold is buttered, the butter can sneak out of the bottom part. I place the pan over a cookie sheet covered with parchment paper, which absorbs any liquid that will leak out.
Giangi's Kitchen provides nutritional information, but these figures should be considered estimates, as a registered dietician does not calculate them.