1 cup  all-purpose flour
1/2 teaspoon baking powder
1/2 teaspoon baking soda
1/4 teaspoon salt
1/2 stick unsalted butter, softened
2/3 cup sugar (plus a couple of tablespoons for sprinkling on top)
1/2 teaspoon vanilla extract
1/2 teaspoon lemon zest
1  egg
1/2 cup buttermilk, shaken
1 cup fresh berries

Procedure:

1. Preheat oven to 400 degrees. Butter and flour a 9 inch round pan. Set aside.

2. Mix together flour, soda, powder, and salt and set aside.

3. Cream together butter and sugar in a different bowl using an electric mixer on high speed.. Beat until light yellow and fluffy, about two minutes.

4.  Beat in lemon zest, vanilla, and egg. 

5.  Turn mixer to low speed and add half  of the dry mixture, all of the buttermilk, and the other half of the dry mixture. Mix until just combined.

6. Spoon batter into prepared pan and smooth top.

7. Scatter berries evenly over the surface of the cake and sprinkle with two tablespoons of sugar.

8. Bake at 400 degrees for 15-20 minutes or until a wooden toothpick inserted in the center comes out clean.

9. Cool in pan before inverting on to a plate.