Position a rack in the center of the oven and preheat to 350 F. Spread the hazelnuts on a baking sheet and toast for 12 to 15 minutes, or until golden beneath the skins. Wrap the nuts in a clean towel and cool completely. Transfer the cooled hazelnuts to a large sieve and rub them back and forth to remove the loose skins. Make the chocolate butter cake: Position a rack in the center of the oven and preheat to 375 F. Line the bottom of a 17 1/2-by-11 1/2-inch jelly roll pan with parchment or waxed paper. Lightly spray the bottom and sides of the pan with nonstick cooking spray. In a medium bowl, whisk together the flour, cocoa powder, baking soda and salt. Sift the flour mixture onto a piece of waxed paper and set aside. In a 4 1/2-quart bowl of a heavy-duty electric mixer using the paddle attachment, beat the butter at medium-high speed for 1 minute, until creamy. While continuing to beat the butter, gradually add the granulated and brown sugars, stopping the machine and scraping down the side of the bowl as necessary. Beat the butter/sugar mixture at medium-high speed for 2 minutes, until smooth. Beat in the eggs, one at a time, and the vanilla. Reduce the speed to low and alternately add one-third of the reserved dry ingredients and one-third of the coffee. In two more batches, alternately add the remaining dry ingredients and coffee, scraping down the bowl as necessary. Scrape the batter into the prepared pan and, using a metal cake spatula, smooth the batter evenly into the pan. Bake the cake for 25 to 28 minutes, until the sides just begin to pull away from the pan and the surface springs back when lightly touched. Cool the cake in the pan set on a wire rack for 10
minutes. Invert the cake onto a wire rack; carefully peel off the parchment paper and allow the cake to cool completely.

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Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your caloric needs.