Chop some of the red onion finely. Put the remainder in the fridge for another use.
Step 2:
Toast Bread to desired crunch, then butter.
Step 3:
If the thought of eating certain bits of the fish bothers you, i suggest taking them out first. But it really does taste all the same. So spread as little, or as much on the bread as you like.
Step 4:
Spread the onion on top, and finish with a sprinkling of black pepper.
