Place the ingredients into the slow cooker in the following order: chopped onion and celery, lamb, potatoes, sweet potatoes, broth, and spices.
Set the slow cooker to low and cook for 6 hours. You could also set the slow cooker to high and cook for 4 hours.
Serve with crackers or fresh bread.
Notes
If you don't have lamb, this can be made with beef stew meat.Store leftover soup in an airtight container in the refrigerator. It should stay fresh for 3-4 days.