for the Cake
4 1/2 cups all purpose flour
1 1/2 teaspoons baking powder
1 teaspoon salt
12 ounces (3 sticks) unsalted butter at room temperaturr
2 1/2 cups granulated sugar
6 large eggs at room temperature
2 3/4 cup milk, at room temperature
1/4 cup fresh lemon juice
1 1/2 teaspoon vanilla extract
for the blackberry cream filling
1 1/2 cup fresh blackberries
2 tablespoon water
1/8 teaspoon salt
2 teaspoon unflavored gelatin
3 tablespoons cold water
8 ounces marscapone cheese, at room temperature
2 cups cold whipping cream
1 1/2 cups confectioner's sugar
1 teaspoon vanilla extract
for lemon cream frosting
2 cups cold heavy whipping cream
10 ounces lemon curd, homemade or purchased
1 teaspoon vanilla extract
3/4 cup confectioner's sugar
1 teaspoon salt
For Garnish
as needed fresh blackberries
as needed yellow and purple sprinkled