We like using nice slices of salmon on the top of the sandwich cake. Try to arrange in a nice pattern and let it overhang slightly on the sides to avoid blunt corners.
Using a cheese slicer or mandolin, cut long pieces of cucumber and use to decorate the sides. If you need a bit more mayonnaise to make it stick, well, so be it.
Once the sides are looking neat, you can decorate the top. This is the bit where you’re likely to overdo it. We tend to simply add some Skagenrora on top and then add loads of prawns and simply decorate with sprigs of dill.
When done, refrigerate before eating.