Ingredients: 
Heavy cream ...........1-1/4 cups
Sugar .....................1-2/3 cups
Good-quality unsweetened chocolate....6-1/2 ounces
Such as Scharffenberger or Callebaut, finely chopped
Unsalted butter.........3/4 cup (1 1/2 sticks)
Slightly softened, cut into pieces
Pure vanilla extract ...1-1/2 ts

For the cake:
Boiling water ............1/2 cup
Unsweetened cocoa powder (not Dutch process)...1/2 cup
Plus extra for dusting the pans
High-quality unsweetened chocolate......4 ounces
Such as Scharffenberger or Callebaut, coarsely chopped
Cake flour ................1-3/4 cups
All-purpose flour .......6 tbs.
Baking powder .........1/2 ts
Salt ........................1/4 ts
Unsalted butter, softened ....1-1/4 cups (2 1/2 sticks)
Sugar .......................2-1/2 cups
Egg .........................1 whole
Eeggs, separated ......5 large
Pure vanilla extract ....1 tbs
Quark, such as Ellen`s Nonfat,
Stirred until smooth ...1 cup