Place the yoghurt in a bowl along with all the other ingredients up to and including the salt, beat for approx. 3 mins. using the whisk on a hand mixer. Combine the flour, almonds and baking powder, mix in. Transfer the cake mixture to the prepared tin, arrange the grapes on top.
Approx. 35 mins. in the centre of an oven preheated to 200°C. Remove from the oven, allow to cool slightly, remove the tin frame, slide the cake onto a cooling rack and leave to cool completely.