Spicy Tomato Soup With Lamb Meatballs and Israeli Couscous

Name: Spicy Tomato Soup With Lamb Meatballs and Israeli Couscous
Ingredients: 1 slice white sandwich bread, crusts removed and torn into small pieces; 2 tablespoons milk; 1 pound ground lamb; 1½ teaspoons coriander; 1 garlic clove, finely chopped; 1¼ teaspoons kosher salt, divided; ½ teaspoon black pepper, divided; 1 cup Israeli couscous; 3 small yellow onions, finely chopped; 2 tablespoons harissa; 2 tablespoons extra-virgin olive oil; 1 28-ounce can crushed tomatoes; 6 cups low-sodium chicken broth; Sliced mint leaves, for serving