Cake: Set a rack in the middle of the oven and preheat to 350 degrees F.
Lightly grease two (9-inch) cake pans and line them with circles of parchment
paper or greased wax paper.
Sift flour, cocoa, ancho chile powder, cayenne, baking soda, baking powder
and salt onto a sheet of wax paper. Sift 2 more times to mix and aerate.
Put butter and sugar in the bowl of an electric mixer and beat at high speed
for 30 seconds, or until well combined and smooth. Add eggs, one at a time,
beating until each is incorporated. Continue beating, scraping down the sides
of the bowl if necessary, until light and fluffy, about 5 more minutes.
With the mixer on a low setting, or using a rubber spatula, beat or fold
in one-third of the flour mixture. beat or fold in vanilla extract, half of
the buttermilk and half of the coffee, then another one-third of the flour mixture.
Beat or fold in the remaining buttermilk and coffee, then the remaining flour
Spread batter evenly in prepared pans.
Bake for 30 minutes or until the centers spring back when lightly pressed.
Cool the cake layers in the pans on a wire rack. Invert each cake onto a
plate. Trim the tops flat with a serrated knife.
Spread one-third of the Ganache over one layer. Flip the other layer on
top, and frost the top and sides of the cake with the remaining Ganache.
Ganache: Put chocolate in a small bowl. In a small saucepan, bring cream
to a scald over medium heat. Pour the hot cream over the chocolate. Working
from the center out, gently stir to melt and blend until smooth. Let the Ganache
sit until slightly thickened, about 10 minutes. It should be spreadable, but
still pourable. If the Ganache doesn't have a smooth patina, blend in a
few drops of cold heavy cream. A matte finish will dry to a mirror shine