Sour cherries: Weigh the sour cherries and mix in 50 g of the brown sugar. Set aside.
Grease or line a 20 cm cake tin with baking paper.
Preheat the oven 180°C fan / 400°F / Gas 6.
Cake mix: In a large bowl, beat the butter and the remaining sugar until pale and fluffy.
Mix in the ground almonds and vanilla.
Add the eggs one at a time, mixing well after each addition.
Now add the baking powder, salt and flour. Mix until combined.
Chop the chocolate into small chunks and add to the batter along with half of the sour cherries. Gently stir until they are evenly distributed.
Spread the mixture into the cake tin and smooth the surface even.
Scatter over the remaining sour cherries.
Baking: Bake the cake for 25-30 minutes until a toothpick inserted in the middle of the cake comes out clean.
Remove from the oven and leave to cool on a wire rack.
Once cooled, remove from the tin and dust with icing sugar to serve.