Avocado on rye instead of toast is the Scandic touch. The love of avocado seems to have exploded, but I will emphasise: avocado should be seen as a luxury, because they take so much water and effort to grow, and they travel long distances. In Europe you should only eat when in season in Spain.
It’s easy to take a piece of rye bread, then slices of avocado, a bit of lemon juice, and some chili. You then have something nice to eat. Here is a bit more up-scaled version that I love to make on late weekend mornings.