INGREDIENTS
•
 1/2 fennel bulb, very thinly sliced
•
 1/2 cup mixed pitted olives, chopped
•
 1/4 cup olive oil
•
3 tablespoons white wine vinegar
•
2 tablespoons chopped drained capers
•
 1/2 teaspoon crushed red pepper flakes
•
Kosher salt and freshly ground black pepper
•
1 Persian or  1/4 English hothouse cucumber, thinly sliced
•
2 6.7-ounce cans olive oilâpacked tuna, drained
•
Kosher salt and freshly ground black pepper
•
1 12-inch-long ciabatta loaf, halved lengthwise
•
3 hard-boiled large eggs, peeled, sliced
•
2 cups arugula