My take a recipe posted by the lovely Pille a couple of weeks ago. No need for all the sugar as the original recipe suggests just as Pille states. The only difference is using 300g chocolate; the standard bar size of chocolate appears to be 100g bars. I doubt 50g of chocolate makes that much of a difference. I would also recommend a little firming in the fridge time before eating.
No need to repeat the recipe – view on Pille’s Nami Nami blog.