Preheat the oven to 350ºF.
Grease the sides of the springform pan.
Sprinkle 1 tablespoon of sugar into the springform pan and tap on the sides to make sure that it is evenly distributed over the bottom and sides.
Melt the chocolate pieces in the double boiler.
Add the margarine, and 3 tablespoon of sugar to the double boiler.
Remove the bowl from the heat and stir in the vanilla and salt.
Beat the egg whites until soft peaks form. Gradually add 2 tablespoon of sugar. Once the sugar has been added, continue beating the mixture until stiff peaks form.
In a separate bowl, beat the egg yolks.
Mix a large spoonful of the warm chocolate into the egg yolks.
When the eggs have been tempered, pour them into the chocolate and stir.
Fold a large spatula full of the beaten egg whites into the chocolate mixture and then fold the remaining egg whites in as well.
Pour 3 cups of the mixture into the pre-greased springform pan and bake for 25 minutes.
Cool in the refrigerator for 20 minutes. Pour the remaining batter onto the top of the cake and refrigerate until cool.
Slice strawberries and use as garnish