Easy Lamb Chorba with Chickpeas and Millet

Ingredients

• 1 tablespoon olive oil
• 1 pound boneless lamb shoulder ((trimmed and diced))
• 1 large onion ((chopped))
• 2 stalks celery ((chopped))
• 2 carrots ((chopped))
• 1 teaspoon ground cumin
• 1 teaspoon ground coriander
• 1 (28-ounce) can crushed tomatoes
• 4 cups less-sodium chicken broth
• 1 tablespoon harissa
• 1 teaspoon saffron threads
• 2 (15.5-ounce) cans chickpeas ((drained and rinsed))
• ½ cup uncooked millet
• 2 tablespoons lemon juice
• ¼ cup chopped parsley