Start making the pickled red onion. Boil the water, and add the boiling water to a steilized jar together with sugar and apple cider vinegar. Mix until the sugar has dissolved.
2
Cut the red onion into strips and add to the jar. Cover with a lid and set aside for at least 1 hour.
3
Add some optional spice to the mackerel filet (I used salt, pepper and chili spice) and fry in the pan with some butter until the filet is fully cooked through.
4
Toast the bread and top with parsley dressing, fried mackerel filet, cucumber salad and pickled red onion.
