Preheat the oven to 325 degrees and butter and flour a 10 inch springform pan.  Line the bottom with wax paper or parchment paper.  Butter and flour the lining.

In a food processor grind the almonds in 3 batches pulsing each with 2 T sugar for a total of 6 T of sugar.  Set aside.

In a double boiler melt the chocolate and butter together.

In a mixing bowl beat the egg yolks until lemon colored and then gradually beat in the 10 T sugar.

Add the melted chocolate and butter to the egg yolks.  Stir to mix and fold in the ground almonds and stir will.

In a clean bowl beat the egg whites with the ¼ c of sugar until they are stiff.  The fold the egg whites into the chocolate batter.

Pour the batter into the prepared cake pan and bake on a cookie sheet for 90 minutes or until a toothpick inserted in the center comes out clean.

Let cool for 15 minutes and remove the sides  from the springform pan.

When the cake has cooked turn it upside down onto a serving plate and dust with confectioners sugar.