Couscous with Arugula and Balsamic Tomatoes

Name: Couscous with Arugula and Balsamic Tomatoes
Ingredients: 2 tablespoons extra-virgin olive oil plus 1/2 cup; 1 1/2 cup fine diced yellow onion; 3 tablespoons minced garlic; 6 cups chicken stock; 1 tablespoon salt, plus more for seasoning; 1 teaspoon white pepper, plus more for seasoning; 1 1/2 cup diced dried apricot; 6 cups Moroccan couscous; 3 cups chopped seedless kalamata olives; 12 ounces pine nuts, toasted; 1 cup snipped chives; 3 cups feta cheese; 8 whole Roma tomatoes; 1/2 cup balsamic vinegar; 1 pound baby arugula, for garnish