In a large bowl, whisk together the flour, baking powder, and salt. Set aside.
In another bowl, beat the butter with a hand mixer until creamy (about 1-2 minutes).
Add the orange zest and sugar and beat until fluffy (about 3 minutes), scraping the bowl frequently.
Add the eggs, one at a time, beating on medium speed for about a minute after each addition.
Add the flour mixture, the orange juice, and buttermilk alternately to the butter mixture, beating on high speed until thoroughly combined.
Pour into prepared pan and bake for 45-50 minutes, or until an inserted toothpick comes out clean. When it’s done, remove the cake from the oven and allow it to cool in the pan for about 15 minutes.
Then invert the cake on a wire rack or a large serving plate and allow it to cool completely before adding the Ouzo Chocolate Ganache.