Step 1: Prepare the Tuna

1. Place the tuna loin in the freezer for 10–15 minutes. This will firm it up, making it easier to slice.
2. Using a very sharp knife, slice the tuna into thin pieces, about 1/8-inch thick. Arrange the slices on a chilled platter or individual plates in a single layer.

Step 2: Make the Dressing

1. In a small bowl, whisk together the olive oil, lemon juice, orange juice, lemon zest, sea salt, and black pepper. Taste and adjust seasoning as needed.

Step 3: Assemble the Crudo

1. Drizzle the citrus-olive oil dressing evenly over the tuna slices.
2. Sprinkle the capers, parsley, and oregano over the tuna for added flavor.

Step 4: Garnish and Chill

1. Add optional garnishes such as thinly sliced red chili for heat, microgreens for freshness, or shaved fennel for crunch.
2. Cover loosely with plastic wrap and chill in the refrigerator for 10 minutes to allow the flavors to meld.

Step 5: Serve

1. Remove from the refrigerator and serve immediately. Pair with crusty bread, grissini, or a side of arugula salad for a complete dish.