Combine the yoghurt with the baking soda. Add all the other ingredients for the mixture while beating nonstop.
Pour it into an oven dish, laid out with baking paper or greased. Bake in a preheated 374°F (190 °C) oven.
Leave it to cool. Cut it into cubes.
Mix all the ingredients for the topping and leave them on the stove for 3 min. to boil.
Pour the hot topping over the cooled cake.