Cake ingredients must be at room temperature or slightly warm (butter may be slightly cool).
In an electric mixer with a paddle attachment, combine dry ingredients.
Then, slowly add the butter, a pat (or roughly a half-tablespoon) at a time. Continue mixing on low until the batter looks like course sand.
In another bowl or a large measuring cup, combine 1 cup buttermilk, oil, and extracts.
Gently pour the buttermilk mixture into the batter and beat at medium (speed 4 on a KitchenAid) for 5 minutes. Scrape down sides.
In another bowl or measuring cup, whisk together the remaining ½ cup buttermilk and eggs. Slowly add this to the batter and mix until thoroughly combined. Scrape down the sides to thorough incorporate all ingredients.
Pour the batter evenly into three 9-inch pans prepared with wax/parchment paper and shortening. If you have a food scale, weigh the filled pans to ensure even distribution of batter.
Bake at 325°F for 30 minutes or until done. Cool in pans for 20 minutes.
Remove layers from pans, remove wax paper/parchment from cakes, and stack the layers (with a sheet of parchment between the plate and the first layer and between the layers). Cover the stacked cakes with a cake lid until completely cool. Refrigerate until ready to assemble.
To assemble: Glaze (if desired) and then frost the first layer. Top with berries of choice. Do the same with the second layer and then frost the top of the third layer and the sides of the cake. Garnish the top with additional fruit, piped frosting, mint leaves, lemon balm leaves, etc.