In an 8-quart slow cooker greased well with cooking spray layer onions, turnips, carrots, celery, leeks, and lamb.
Season lamb with garlic, rosemary, salt, and pepper.
Add barley and enough beef broth to cover.
Cook on low for at least 8 hours or up to 20 hours.
Mix in handfuls of fresh spinach just before serving.
Gluten Free: Swap quinoa for barley.
Vegetarian: Swap beets for meat.
Recipe courtesy of 28 Day JOY of KOSHER Challenge.