Preheat oven to 350°F (180°C). Grease two 9" cake pans (or three 6" pans) and line with parchment, spray again and dust with flour; set aside.
In a mixing bowl, blend softened butter, oil and sugar.
Add eggs one at a time, beating in between each addition.
Add flour, salt, baking powder, buttermilk, lemon extract and lemon zest. Continue to beat for 1 minute more.
Spoon batter into cake pans. Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean.
Remove from the oven and let cool in the pan on the rack for 15 minutes. Transfer to a cooling rack.
Frost with desired frosting, or sprinkle with powdered sugar and serve with whipped cream.
Frost with your favorite icing and fill between layers with fruit if desired.