Flourless chocolate cake for Pesach

From Alan -- Joel Cohen's mom's recipe

12 eggs, separated
12 ounces of chocolate
12 ounces of butter
12 ounces of sugar

Melt chocolate and butter in a double boiler, add sugar. When cool, add egg yolks.

Whip egg whites until stiff peaks. fold in to chocolate mixture. Pour 2/3 of the mixture into a springform pan and bake at 350 degrees for about 20 minutes or until a toothpick comesout clean. (refrigerate the remaining 1/3)

Let the cake cool -- it will collapse. Spoon the remaining mousse into the cavity in the cake and refrigerate.