Preheat oven to 350 degrees. Lightly spray at 8- or 9-inch springform pan with cooking spray, then dust with additional ground almonds, shaking off any excess.
In double boiler set over barely simmering water, melt the chocolate, butter, sugar and salt, stirring frequently. Remove from heat.
In medium bowl, beat the eggs and 1 tablespoon of ground almonts. Fold the egg mixture into the cholocate and stir until thickened, several minutes.
Pour the batter into the pan and smooth the top. Bake 45 minutes, or until the top is set and begins to crack. Remove the side of the pan and let the cake cool completely. Dust with confectioners' sugar, if desired.