To make a loose bottom, you can crumble ready-made cookies or make your own coconut crispy bottom. Preheat oven to 190 degrees. Put 50 g sugar, 50 g flour, 50 g butter and 40 g coconut flakes in the bowl, process it by hand to get a loose mass, then place it on a baking pate and bake for 10 minutes or until browned.