1 stick (1/2 cup) plus 1 tablespoon unsalted butter, softened
3 large eggs
1 cup plus 2 tablespoons granulated sugar
1 tablespoon instant espresso powder
1 tablespoon vanilla extract
6 tablespoons sifted all-purpose flour
3/4 teaspoon salt
1/2 teaspoon baking powder
1 1/2 cups walnuts
1 1/2 cups pecans
Heat oven to 325 degrees F.
In a double boiler or a metal bowl set over a pan of barely simmering water
melt unsweetened chocolate, 9 ounces semisweet chocolate, and butter, stirring
occasionally, and remove top of double boiler or bowl from heat.
In a bowl with an electric mixer beat eggs with sugar until light and fluffy.
Add espresso powder, vanilla extract and chocolate mixture, beating until smooth.
In a small bowl whisk together flour, baking powder, and salt and add to
chocolate mixture, beating until just combined. Stir in remaining semisweet
chocolate and nuts until combined well.