Toast 1 cup nuts; set aside for top.
In double boiler, melt:
12 T. unsalted butter with 6 oz. unsweetened chocolate
Pour into bowl and gradually whisk in 2 1/4 cups sugar
Whisk in 4 large eggs, one at a time
Sift together and fold into chocolate etc.
1 1/4 cups cake flour
1/2 tsp. salt
3/4 tsp. baking powder
Line a 9 by 13 inch baking pan with foil sprayed with spray of oil
Bake at 325 for 30 to 35 minutes. Cool on a rack for a couple of hours before lifting out of baking dish on foil.