Preheat the oven to 350 degrees F. Butter a 9-inch springform pan, then line the bottom and sides with parchment paper and butter the paper. Wrap the outside of the pan with foil.
Make the praline layer: Melt the butter in a saucepan over medium heat. Whisk in the brown sugar, corn syrup, kosher salt and vanilla. Spread in the prepared pan and scatter the pecans on top; set aside.
Make the cake: Whisk the flour, baking soda, nutmeg and fine salt in a large bowl. Whisk the buttermilk and bourbon in another bowl.
Beat the butter and granulated sugar with a mixer on medium-high speed until fluffy, 10 minutes. With the mixer on low, beat in the eggs, one at a time. Add the flour mixture in three parts, alternating with the buttermilk mixture, starting and ending with flour. Fold in the pecans.
Pour the batter into the pan and bake until a toothpick inserted into the center comes out clean, about 1 hour. Cool on a rack, 30 minutes. Remove the springform ring, invert the cake onto a plate and remove the paper. Serve with ice cream.