Make sure they are smaller than the diameter of your apple rounds.
Cut the apple into rounds.
Sprinkle a little sugar onto both sides of the apple rounds and lightly fry them in a pan with some butter for s couple of minutes. Don’t overdo it or they will become too soft.
Remove immediately once they start to brown and let them cool down.
Cut the red onions into fine rings and put aside.
Slice the pickle into fine slices and put aside.
Cut the herring into bite size pieces, slightly smaller than the apple rounds.
Take one slice of apple, and stack one piece of herring, followed by one slice of potato, followed by a bit of mayonnaise and some black pepper, followed by a piece of herring and a fine slice of pickle.
Top the whole thing of with a small triangular shaped piece of lemon and 2-3 thin red onion rings.
Stick a toothpick in the middle to hold everything in place.