Israeli Couscous and Tuna Salad

Name: Israeli Couscous and Tuna Salad
Ingredients: 2 cups Israeli couscous (10 to 12 ounces); 2 (7-ounce) cans or jars Italian tuna, drained and flaked; 2 teaspoons grated lemon zest (2 lemons); 1/4 cup freshly squeezed lemon juice; 1/2 cup good olive oil; 3 tablespoons capers, drained; 1/2 cup pitted, oil-cured black olives, coarsely chopped (3 ounces); 1/2 cup jarred roasted red peppers, medium-diced (4 ounces); 2 teaspoons minced garlic (2 cloves); Kosher salt and freshly ground black pepper; 1 cup chopped scallions (6-8 scallions); 1/4 cup julienned fresh basil leaves, lightly packed; Juice of 1/2 lemon