In a mixing bowl whip eggs & sugar together until eggs become lemon yellow in color. Meanwhile, put chocolate into a double boiler and melt. Allow to cool slightly. Now add butter to warm chocolate. Then fold chocolate into whipped eggs.
Put into an oiled spring form pan. Cover pan with aluminum foil and bake for 20 minutes in 350 degree oven covered and an additional 10 minutes uncovered. Remove tort from oven and refrigerate. Allow to cool for at least 6 hours before cutting and serving.
Serve with whipped cream, fresh berries and choice fruit puree.