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Equipment: 10 cup bundt pan
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Place a rack in the middle of the oven and preheat to 350 degrees F. Butter and flour the bundt pan.
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Sift the flour, cocoa, and salt into a medium bowl.
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Whisk the eggs, yolks, vanilla, and espresso powder together into a bowl and set aside.
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In a heavy duty mixer, beat the butter with the paddle attachment, on medium speed for 1 minute, or until smooth.
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Gradually pour in the sugar, 1/4 cup at a time, until the butter begins to lighten, about 3 minutes.
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Scrape down the sides of the bowl with a rubber spatula and beat, on medium-high, until light and fluffy, about 4 minutes more.
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Adjust the mixer's speed to its lowest setting.
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Add 1/2 of the flour mixture and mix until completely absorbed before adding the rest.
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Scrape down the sides of the mixer then beat on medium-high for 30 seconds more.
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Adjust again to low speed and add half the egg mixture, mix until blended and smooth.
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Add the remaining egg mixture and beat until almost blended.
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Remove the bowl from the mixer, and fold in the chocolate by hand.
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Take care not to over mix the batter.
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Spoon the batter into the prepared pan and smooth the top with a spatula.
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Bake until a toothpick inserted into the center comes out clean, about 1 hour and 10 minutes.
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Cool the cake in the pan, on a rack for 10 minutes.
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Turn the cake out of the pan, and cool right side up on a rack.
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If not serving the same day, wrap in plastic wrap and store at room temperature.
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Glaze just before serving.
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Cake can be frozen for 1 month.
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For the glaze: Put all the ingredients in a microwave safe bowl or glass measuring cup.
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Melt at 50 percent power in the microwave until soft, about 1 minute.
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Stir, and continue heat until completely melted, about 1 minute more.
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Remove from the microwave and whisk until fully combined, smooth and glossy.
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While warm, pour glaze over cooled cake and do not spread.
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Serve as desired.