Tuna Tartare in a Cucumber Boat topped with Caviar

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   ["With a heavy sharp knife, chop tuna into very small slices.", "In a mixing bowl, combine tuna, chives, capers, shallots, lemon juice, oil, salt and freshly ground pepper and chill for 1 hour.", "While tuna is chilling, prepare cucumber boats.", "Peel cucumber and cut into 2-inch long cylinders.", "With a teaspoon, scoop out the seeds from inside the cucumber disk without touching the very bottom of the cucumber.", "(In other words, leave a ""bottom"" in the hollowed-out center of the cucumber.)", "Season cucumber with salt and pepper.", "Fill with 1-ounce of tuna tartare.", "Top with 1/8 teaspoon of caviar.", "Finish with a sprig of parsley."]

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