Ingredients

  • 1 1/2 sticks unsalted butter, plus additional for greasing pan
  • Fine breadcrumbs or flour for dusting
  • 1 cup blanched hazelnuts or almonds
  • 12 ounces semisweet chocolate
  • 1/2 cup honey
  • 10 eggs, separated
  • 1/4 teaspoon salt
  • 3/4 cup heavy cream
  • 12 ounces semisweet chocolate

Method

  • Preheat oven to 375 degrees.
  • Butter a 10-by-3-inch round or springform cake pan.
  • Line bottom with parchment.
  • Butter parchment.
  • Dust with fine breadcrumbs or flour.
  • Shake out excess.
  • To make cake: Grind nuts to a powder in a food processor.
  • Set aside.
  • Break up chocolate and melt in the top of a double boiler over shallow, warm water on moderate heat.
  • Transfer to a bowl and let cool.
  • Meanwhile, in the bowl of an electric mixer, beat butter until soft.
  • Gradually add honey; beat until smooth.
  • Add egg yolks, two or three at a time, beating until mixed after each addition.
  • (The mixture will look curdled, but it is O.K.)
  • Add nuts.
  • In another bowl, beat egg whites with salt until whites barely stand up when the beater is raised.
  • Fold egg whites into chocolate in three batches.
  • Pour into pan.
  • Bake at 375 degrees for 20 minutes.
  • Reduce temperature to 350.
  • Bake for 50 minutes more, until a cake tester comes out clean.
  • Remove and let cool.
  • Remove from pan.
  • With a long sharp knife, level top.
  • To make frosting: Break up chocolate.
  • In a saucepan over medium heat, cook cream until it forms a skin on top.
  • Add chocolate, reduce heat to low and stir with a whisk until smooth.
  • Transfer to a bowl and stir occasionally until cool and slightly thick.
  • Pour icing over cake and smooth top and sides until covered.
  • Serve immediately, or store overnight at room temperature.