
For the filling:
1 Tablespoon
unsweetened Dutch process cocoa, + 1-3/4 teaspoons
2 cups
boiling water
3/4 cup
sugar, + 3-1/2 teaspoons
1 oz.
bittersweet chocolate, chopped
2 Tablespoons
cornstarch
1 Tablespoon
cold water
1/4 Teaspoon
salt
1 Teaspoon
vanilla extract
2 Tablespoons
unsalted butter
Frosting:
12 ozs.
semisweet chocolate, chopped
3/4 cup
unsalted butter
1/2 cup
hot water
1 Tablespoon
corn syrup
1 Tablespoon
vanilla extract
Preheat the oven to
375 F. To make the cake, place the cocoa in
a small bowl and whisk
in boiling water to form a paste. Combine
the chocolate and
milk in a saucepan over medium heat. Stir
frequently as the
mixture warms and the chocolate melts, about 3
minutes. Remove from
heat. Whisk a small amount of the heated
chocolate milk into
the cocoa paste and then whisk the cocoa paste
into the milk mixture.
Return to heat, stir for one minute, remove
and cool until tepid.
In a small bowl of a mixer, cream the sugar
and butter together.
Beat in the egg yolks one at a time and add
the vanilla. Slowly
stir in the chocolate mixture. Combine the
flour, baking powder,
salt and baking soda. Using a spatula or a
wooden spoon, slowly
add the flour mixture to the chocolate mixture.
In another bowl, whip
the egg whites to form soft peaks and, using
a rubber spatula,
gently fold the egg whites into the batter. Butter
and lightly flour
two 8 inch round cake pans and divide the batter
between the two pans.
Bake for 45 minutes and cool on a rack for 15
minutes. Gently remove
the cakes from their pans and continue to cool.
While the cake is
baking, make the filling. Put the cocoa into a
saucepan and pour
in the boiling water and place over low heat. Add
the sugar and chocolate.
Dissolve the cornstarch in the cold water
to make a smooth paste.
Whisk the cornstarch mixture into the water
and chocolate, add
the salt and bring it to a boil, stirring constantly.
Boil for one minute.
Remove the pan from the heat, whisk in the vanilla
and the butter and
transfer the mixture to a bowl and refrigerate until
cool. Make the frosting:
In a double boiler (or a pan within a pan),
melt the chocolate.
remove from heat and whisk in the butter, one
tablespoon at a time,
returning to the heat if necessary to melt the
butter. Whisk in the
hot water all at once and stir until smooth.
Whisk in the corn
syrup and the vanilla. Refrigerate for up to 15
minutes before using.
Assemble the cake: Use a sharp knife to slice
each cake into two
disks to form 4 layers. Set one layer aside. Place
one layer on a cake
round or plate. Generously swath the layer with
filling. Add the second
layer and repeat. Add the third layer. Quickly
apply a layer of frosting
to the top and the sides of the cake and
refrigerate for 10
minutes. Meanwhile, crumble the remaining cake
layer, into fine crumbs.
Apply a second layer of frosting to the
cake, sprinkle liberally
with crumbs and serve within 24 hours.
Store in a cool place.
