Add beef, carrots, celery, onion, salt, pepper, water, tomato soup and tapioca into slow cooker. Stir. If using flour instead of tapioca then toss the meat in the flour and coat it well before adding it into the slow cooker.

Place the potatoes on top.

Cover slow cooker and cook on low for 5-7 hours, or until potatoes and beef are fork tender.

Use tongs to place potatoes into a mixing bowl. Mash the potatoes. Stir in the butter, milk and salt and pepper to taste.

Salt and pepper the beef mixture to taste.

Place a scoop of potatoes onto each serving plate and ladle a scoop of the beef mixture over the top. Enjoy!