Mexican Lemon Cake

CAKE
3 cup flour sifted
1 tbl baking powder
1 tsp baking soda
1/2 tsp salt
1 cup unsalted butter room temperatureerature
2 cup granulated sugar
4 lrg eggs slightly beaten
1 1/4 cup buttermilk
1 1/2 tsp vanilla extract
Zest of 2 lemons
LEMON CURD
12 lrg egg yolks
Zest of 2 lemons
1 cup fresh lemon juice
1 1/2 cup sugar
1 cup cold unsalted butter cut in pieces
SWEETENED WHIPPED CREAM
2/3 cup heavy cream
1/2 tsp vanilla extract
2 tbl confectioners' sugar
GARNISH
12 oz assorted fresh berries
Confectioners' sugar