3 medium – large beets
¾ cup butter, plus additional for greasing
¾ cup buttermilk
2 tablespoons lemon juice
2 teaspoons champagne vinegar
1 teaspoon pure vanilla extract
2 cups cake flour
3 tablespoons Dutch process cocoa powder
3 tablespoons or 1.5oz semi sweet chocolate
1 ⅛ teaspoon baking powder
1 teaspoon salt
½ teaspoon baking soda
1 ¾ cup granulated sugar
3 eggs separated
Crème fraiche frosting (8 oz + 1 cup confectioners sugar whipped)