Cut the salmon fillet, avocado, fennel and half of the cucumber into very fine cubes (maximum 0.5 cm in size). Finely slice the rest of the cucumber.
Mix everything in a bowl. Grate half of the lime peel and add to the bowl along with the lime juice (more or less to taste). Pour a good dash of olive oil over it and season with salt, pepper, chilli and soy sauce to taste. Let it steep a little (approx. 30 minutes).
Arrange the cucumber slices in a fan shape on a small plate and use an ice cream scoop or a tablespoon to place a scoop of salmon tartar on each. Decorate with a little lime zest, pepper and a few drops of olive oil and soy sauce. The crab chips are enough
Tip: If you like, you can mix in finely chopped spring onions or garlic.