Tuna Tartare in a Cucumber Boat topped with Caviar

INGREDIENTS

• 1 teaspoon chopped chives
• 6 ounces sushi tuna
• 1-ounce extra-virgin olive oil
• 1 teaspoon chopped shallots
• Freshly ground black pepper
• 1 lemon, juiced
• 3 to 6 cucumbers (to make 6 cucumber "boats")
• 6 parsley sprigs
• 1-ounce American farmed black caviar
• 1/2 teaspoon chopped capers
• Salt