Some would argue this is not a cake, but I put it in the cake category.  Garnish with raspberry coulis (reduction of 2 cups of raspberries and 2 Tbsp sugar), whipped cream, and fresh raspberries.

Chocolate Decadence
adapted from Forest Gump™ My Favorite Chocolate Recipes

Ingredients:
2 2/3 cups (16 ounces) semisweet chocolate
2/3 cup butter
5 eggs
2 Tbsp sugar
2 Tbsp flour

Directions:

1. Preheat oven to 400°.
2. Line the bottom of a 9-inch springform pan with parchment paper.
3. Melt butter and chocolate together – use microwave or double boiler.
4. Place eggs in a large mixing bowl.  Temper the eggs with some of the chocolate mixture.  Slowly incorporate all of the chocolate.  Beat at medium speed for 10 minutes.
5. Fold in the sugar and flour.
6. Pour batter into prepared pan.  Bake for 15 minutes.  Dessert will not be set in the center.)  Remove from oven; cover and chill thoroughly.