Chocolate cake

It's almost X'mas and I've a lot of projects in my kitchen!
Here you are a very special chocolate cake, perfect for kids and boyfriends. It's very soft and wet: a lustful dessert. Serve with a glass of Italian dry spumante.
It's my X'mas present for you: Merry X'mas to everyone!


Ingredients:
200 gr. butter
200 gr. dark chocolate (70%)
150 gr. sugar
150 gr flour
4 eggs
1 teaspoon rhum
a pinch of backing powder (optional)
1 teaspoon cinnamon or red pepper (optional)
icing sugar (optional)

Mix yolks and sugar into a light cream. Then add flour a little at a time, avoiding lumps.
I suggest to mix a pinch of baking powder to flour: your cake will be fluffier.
Melt in a double saucepan butter with chocolate, add a teaspoon of rhum (or other liquor). If you like spicy flavours, add a teaspoon of cinnamon or red pepper (be careful: it's really hot!).
Stir this chocolate mixture together with the rest of ingredients, by using a wooden spoon.
Beat whites to stiff peaks and pour them gently into the mixture.
Grease a round pan (26cm - 10inch of diameter), spread the mixture evenly into it, then bake for 30 minutes at 170° C (325°F). The cake have to remain a bit wet.
Make the cake cool, remove it from the pan and, if you like, dust icing sugar on the top.