1Preheat oven to 180 ° C (thermostat 6). Melt the chocolate in a saucepan.
2Out of the fire, add the butter ,
3flour and yeast.
4Whisk the egg yolks with the sugar
5and a little water to lather
6then add it to the chocolate mixture.
7Whisk the whites into the pan and stir in the pan gently.
8Pour into a buttered pan with high edges
9and bake for about 35 minutes.
10Add icing sugar or melted chocolate to decorate the top of the cake.