Preheat oven to 375
Prepare pan: 8" round cake or springform (wrap bottom in foil), spray with Baker's Joy or equivalent.
Melt in double boiler:
Remove from heat and set aside.
Beat in mixer until pale and thick (~5 minutes or "ribbon"):
Blend in, then set aside:
In a clean bowl, beat on medium until foamy:
Then add and beat on high until stiff, but not dry:
Fold a small amount of the egg whites into the chocolate mixture to lighten it. Then quickly fold in remaining egg whites.
Pour into pan, then put pan in water bath.
Bake 30-40 minutes until toothpick shows moist crumbs.
Cool completely in pan on wire rack.
In a double boiler, melt:
Decant cake upside down. Pour glaze over the top of the cake and spread quickly. Sprinkle remaining chopped, toasted hazelnuts over top. Leave at room temperature overnight.