4 tablespoons extra-virgin olive oil, divided 2 tablespoons fresh lemon juice 2 large garlic cloves, minced, divided 1/2 teaspoon finely grated lemon peel 1 1/3 cups Israeli couscous (6 to 7 ounces) 1 3/4 cups (or more) vegetable broth 14 ounces slender asparagus spears, trimmed, cut diagonally into 3/4-inch pieces (about 2 1/2 cups) 8 ounces sugar snap peas, trimmed, cut diagonally into 1/2-inch pieces (about 2 1/2 cups) 1 cup shelled fresh green peas or frozen, thawed 1/3 cup chopped fresh chives 1/2 cup finely grated Parmesan cheese Whisk 2 tablespoons oil, lemon juice, 1 garlic clove, and lemon peel in small bowl; set dressing aside. Heat 1 tablespoon oil in heavy medium saucepan over medium heat. Add couscous, sprinkle with salt, and sauté until most of couscous is golden brown, about 5 minutes. Add 1 3/4 cups broth, increase heat, and bring to boil. Reduce heat to medium-low, cover, and simmer until liquid is absorbed and couscous is tender, about 10 minutes, adding more broth by...