Luna Park Mediterranean Tuna Salad Sandwich

An extravagant indulgence, to be sure, but this is the most amazing tuna sandwich I've ever had. These were served at a bridal shower I attended and I shamelessly begged for the recipe, to no avail. Thankfully, I found it on one of my favorite food blogs, Meemo's Kitchen :)

• Ready In: 35 mins
• Serves: 8

Ingredients

• Lemon vinaigrette

• 1  cup canola oil
• 5  tablespoons lemon juice
• 1  tablespoon red wine vinegar
• 4  teaspoons  chopped shallots
• 1 1⁄2 teaspoons salt
• 1⁄2 teaspoon black pepper
• 1⁄2 teaspoon sugar

• Assembly

• 1⁄2 tablespoon olive oil
• 1⁄2 cup  thinly sliced red onion
• 8 (6 ounce) cans  italian light tuna (in oil)
• 1⁄2 cup  chopped parsley
• 2  tablespoons capers
• 2  tablespoons kalamata olives, quartered lengthwise
• 3  cornichons, chopped
• 1 1⁄2 teaspoons lemon juice
• 2  roma tomatoes, grilled, peeled and cut into eighths
•  salt
•  pepper
• 3  loaves  ciabatta  bread
• 12  ounces arugula
• 1  cup  shaved fennel, about half a fennel bulb
• 1  cup  lemon vinaigrette

Directions

1. Lemon Vinaigrette:
2. Pour the oil into a medium bowl. Whisk in the lemon juice, vinegar, shallots, salt, pepper and sugar. Set aside. (Makes 1 1/4 cups.).
3. Tuna Sandwiches:
4. Heat the olive oil in a small saute pan over medium heat. Add the sliced onion and cook 4 to 5 minutes until softened.
5. Drain tuna, reserving a few tablespoons of oil with which to moisten the salad. Flake the tuna and combine it with the parsley, capers, olives, cornichons, lemon juice, tomatoes, onions and reserved oil. Season with salt and pepper to taste.
6. Cut an inch off the end of each loaf of bread. Cut the bread into 4-inch pieces and slice in half. Remove some of the soft center so the sandwich isn't doughy. Grill the bread lightly.
7. In a large bowl, toss the arugula and fennel with the lemon vinaigrette.
8. For each sandwich, place some of the arugula salad on the bottom piece of grilled bread. Top with about 1 1/4 cups tuna mixture. Place more arugula on the tuna and finish with the top piece of bread. Slice in half diagonally and serve.