Rinse the mango. There is a large pit in the middle. You can cut the mango completely vertically along the pit. Then cut it into slices. If it doesn't work, just cut large wedges from the mango. I leave the skin on for the presentation, but you don't eat it... (not me anyway)
Remove the leaves from the lettuce heart and take out the hard part. Divide this over a serving dish together with the arugula. Cut the spring onions into fine rings and shred the chives.
Divide the mango wedges on top of the lettuce. Cut the mackerel into pieces and put them in between. Sprinkle the spring onion over it along with the chives.
Now also divide the pistachios, pecans and chives. Season with salt and pepper.
At the end we add the avocado dressing. Quantity to your own taste.
If you still have dressing left, this is also delicious with a piece of freshly baked fish. You can keep these in the fridge for two days.