Tartare: Cut the salmon and scallops into very fine cubes.
Drizzle with olive oil and black pepper and a little bit of salt.
Take the chilled salt stone out of the refrigerator.
Evenly distribute the tartare on the stone and place it back in the refrigerator.
Dressing: Mix the oil, lemon juice, mustard, honey, pepper, and salt well together.
Pour into a small sauce bowl for the table.
Salad: Peel the celery stalks and cut into fine diagonal slices.
Rinse briefly under cold water and lay on kitchen paper.
Cut the apple into quarters. Remove the core and slice finely.
Drizzle with lemon juice and mix together so everything is well coated.
Keep cool.
Time to serve: Take the salt stone out of the refrigerator.
Distribute the celery, apple, hazelnut, and onion on the tartare.
Scoop onto plates at the table.
Finish the plates with the vinaigrette.
Serving tip: use a cake server.