3/4 cup pitted kalamata olives
2 tablespoons olive oil
2 garlic cloves
1 teaspoon lemon zest
1/4 cup mayonnaise
2 (6-ounce) cans tuna in olive oil, drained
1 (12-ounce) jar marinated artichokes, drained and coarsely chopped
1 teaspoon fresh lemon juice
1/2 teaspoon freshly ground black pepper
1 (16-ounce) ciabatta bread, halved horizontally
1 tomato, diced