Tuna Tartare

Ingredients (16)

• 1 teaspoon white wine vinegar
• 1 1/2 tablespoons extra-virgin olive oil
• 1 pinch kosher salt
• 4 ounces cucumber, peeled, seeded, finely diced
• Kosher salt, to taste
• Freshly ground black pepper, to taste
• 8 ounces sushi-grade tuna
• 1/4 cup red bell pepper, seeded, peeled, and finely diced
• 1/4 cup finely diced shallots
• 1/2 cup peeled and finely diced potato
• 3 teaspoons parsley
• 2 tablespoons mayonnaise
• 4 tablespoons thick sour cream, or Greek yogurt
• 1 tomato, for garnish
• Fresh herbs, for optional garnish
• Sliced avocado, for optional garnish