Grate the two chunks of fish, but separately without mixing them together.
Place them in 2 different containers.
Sprinkle Maldon salt flakes, and then pour a teaspoon of lime juice over each fish mixture. Mix well to blend the flavours.
Smash the avocado with a fork and then add a bit of salt and a teaspoon of lemon puree.
To make the same plating, you will need a small recycled jar in which you will place a layer of avocado puree, one of salmon, one of tuna and then a teaspoon of truffle puree.
Sprinkle a bit of watercress.
The truffle puree can be replaced with thinly shaved truffles