This recipe worked out well in the end, though I had a few little troubles getting it there. The base wasn't enough to cover my pan, which was actually slightly smaller than 20 x 30 so I had to do a double batch of the base. I baked it at 180 C and added just 1 batch of the coconut filling. I couldn't get the chocolate topping to come together with just 1 tbsp water so I added another spoonful. In the end, the bars were very tasty, although I did find the topping a bit sugary. Next time I might go for a simple chocolate glaze instead of an icing-sugar topping.