Finely dice the smoked salmon, half of the apple (e.g. Mairac or Cox Orange variety) and the spring onion and mix together. Chop and fold in the chives. Stir in mustard, honey, lemon juice and olive oil, season with salt (carefully!) And pepper. Let something go.
Cut the remaining apple into thin slices, arrange on plates and drizzle with a little lemon juice.
Finely chop the walnuts and roast them a little in a coated pan, then caramelize with the maple syrup.
Arrange the tartare on the plates and distribute the walnuts on the apple slices.
Serve with toasted bread, possibly brushed with a little butter.