Lamb Tagine with Chickpeas and Apricots

INGREDIENTS

• 3/4 cup dried chickpeas
• Steamed couscous
• 2 tablespoons olive oil
• 2 1/2 cups (or more) low-salt chicken stock
• 1 large cinnamon stick, broken in half
• Kosher salt and freshly ground black pepper
• 3 pounds 1" cubes lamb shoulder
• Chopped fresh cilantro
• 1/2 cup halved dried apricots
• 1 large onion, diced
• 1 tablespoon chopped peeled ginger
• 1 cup canned diced tomatoes with juices
• 5 garlic cloves (2 whole, 3 chopped)