Adjust oven rack to lower third of the oven. Preheat the oven to 325°F (163°C) and spray a 9-cup Bundt pan (I used the Harvest Leaves Bundt) very well with cooking spray (preferably the baking kind with flour in it).
In a large mixing bowl, mix together the dry ingredients (flour through salt).
2 1/2 cups + 2 tablespoons (329 grams) flour, 1 tablespoon + 2 teaspoons pumpkin pie spice, 2 teaspoons baking soda, 3/8 teaspoon baking powder, 3/4 teaspoon salt
In another large mixing bowl, lightly beat the eggs and then add the remaining cake ingredients. Stir until thoroughly combined. Add the dry mixture to the wet mixture, and stir just until combined. Pour the batter into the prepared pan and bake for 50 minutes or until a toothpick inserted in the middle of the cake comes out clean.
3 large eggs, 1 cup (200 grams) light brown sugar, 1/2 cup (160 grams) honey, 3/4 cup (180 ml) olive oil, 2 tablespoons water, 1 1/2 tablespoons vanilla extract, 1 1/3 cups (319 grams) pumpkin puree
Let the cake cool in the pan for 10 minutes and then invert onto a wire rack.
While the cake is cooling, prepare the syrup. In a large saucepan over medium heat, heat the butter, water, sugar and salt until the sugar has dissolved, stirring occasionally. Take the saucepan off the heat and stir in the bourbon (it'll bubble).
1/2 cup (112 grams) unsalted butter, 1/2 cup (120 ml) water, 1/2 cup (100 grams) granulated sugar, 1/4 teaspoon salt, 1/2 cup (118 ml) bourbon
Wash and dry the Bundt pan and place the cake back into the pan. Poke holes into the cake (I used a meat thermometer to do this), about every 3/4" or so. Pour the syrup slowly over the cake. It will get absorbed. Let soak for 2 hours and then invert the cake back onto a serving platter. Cover and store at room temperature for up to 3 days.
General tip: if you have issues with the syrup-drenched cake not coming out of its pan, fill a pot with hot water and submerge 2/3 of the pan in the water and hold it there for 30 seconds. The heat will help loosen the cake from the pan. If it doesn't plop right out, give the top of the pan a good whack.
Let the cake cool completely, about 2 hours. Cover and store at room temperature for up to 3 days.