Instructions: Prepare the dressing: In a small bowl, whisk together all the dressing ingredients. Taste for seasoning. Cover and refrigerate until ready to serve the tartare.

Prepare the relish: Peel the cucumber, cut in half lengthwise, and scoop out the seeds. Cut the cucmber into 1/8-inch dice. In a small bowl, stir together the cucumber, avocado, lemon juice, vinegar, salt, and pepper. Taste for seasoning. Place the tuna in a bowl. Add the dressing and mix gently, blending thoroughly.

For individual servings, use a 1/3-cup measure to scoop out the tuna mixture and invert onto chilled plates. Surround the tuna with relish and scatter mint leaves on top of the relish. Place a few baguette slices on each plate.

For a buffet, use a small bowl to shape the tuna into a single dome in the center of a serving plate. Surround with the relish, mint leaves, and baguette slices.

This recipe yields 6 servings.

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