Inspired by classic Swedish savouries such as smörgåstårta (a sandwich ‘cake’, with bread for the layers), this caviar sandwich cake is a total, utter mash-up, but absolutely delicious. To achieve the ‘red velvet’ look in the picture, you’ll need my homemade beetroot flatbreads; otherwise use a good dark rye bread or whatever you have to hand. The key thing is that the bread doesn’t have too many holes, otherwise the filling will fall through.