In a large bowl beat the egg yolks, whole egg, and ½ cup sugar until mixture is light and fluffy. Add almonds. In a bowl sift together 3 times the cocoa and flour. Fold into the egg mixture alternately with the butter. In another bowl beat egg whites with salt until they hold soft peaks, then beat in 3 tablespoons sugar until they hold stiff peaks. Fold whites into cocoa mixture. Pour into a 9-inch greased cake pan and bake in a preheated 375 degrees F oven for 25 minutes. Invert the cake on a rack and let it cool.