How to make
Extinguish the baking soda in the yogurt. Stir together the flour, cocoa and sugar.
Separately, beat the yogurt with the oil and add in the dry mixture to it, while beating continuously. Finally, mix in the walnuts and vanilla.
Pour the mixture into a greased and floured oven dish and put it to bake in an oven preheated to a moderate temperature.
Let the finished cake cool slightly and smear it with plenty of liquid chocolate. Make a decoration with walnut pieces.
