1.Combine dry ingredients in a bowl (flour, sugar, baking soda, cocoa, salt and carob). Whisk thoroughly
2.Combine wet ingredients in a separate bowl (yoghurt and water). Whisk thoroughly
3.Slowly add wet ingredients to the dry ingredients. Mix until just combined
4.Pour the batter in a round 25 cm cake pan that's been greased and lined with parchment paper. Bake for 25-35 min in a 180°C oven
5.Make the frosting: combine chocolate and milk in a bowl. Microwave until melted at 30 second intervals, stirring each time. Let cool a bit then pour over the cake. Refrigerate until firm