pearl couscous with olives and roasted tomatoes

INGREDIENTS

• 2 pt red grape or cherry tomatoes (1 1/2 lb)
• 3 large garlic cloves, left unpeeled
• 1/4 cup extra-virgin olive oil
• 1/4 cup warm water
• 1 teaspoon fresh lemon juice
• 1 teaspoon salt
• 1/4 teaspoon black pepper
• 2 3/4 cups chicken broth
• 2 1/4 cups pearl (Israeli) couscous
• 1 tablespoon olive oil
• 1/2 cup Kalamata or other brine-cured black olives, pitted and chopped
• 1/3 cup chopped fresh flat-leaf parsley
• 1/4 cup chopped fresh mint
• 1 teaspoon chopped fresh thyme