Wash the cucumber, halve it lengthwise, and remove the seeds. Cut into thin strips with a paring knife to create tagliatelle-like ribbons. Thinly slice the smoked salmon.
Prepare the vinaigrette: Dissolve salt and pepper in the lime juice. Whisk in the olive oil to emulsify.
Arrange the cucumber tagliatelle and salmon slices on a serving platter. Drizzle with vinaigrette and garnish with fresh chervil. Serve chilled.
Pro Tip: Opt for the heart of the salmon fillet if possible—it's the most tender and moist part.

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