Preheat oven to 350 degrees and fill cupcake pan with liners
In a medium bowl, whisk together the flour, baking powder and salt. Set aside
In a mixing bowl, cream the butter and sugar until light and fluffy
Add eggs one at a time, beating after each addition, scrape down the sides of the bowl
Beat in the zest and vanilla extract
Add dry mixture alternating with buttermilk and lemon juice, beating just until combined after each addition.
Divide batter into cupcake liners
Bake at 350 degrees F for 15-20 minutes or until a toothpick inserted in the center comes out clean
Cool on wire rack
Frost with fresh whip cream or frosting of your choice