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Export 11 ingredients for grocery delivery
Heat butter over medium heat until melted. Saute onion and celery until translucent, approximately 5 minutes.
Transfer to slow cooker. Stir in broth and baking soda.
Combine corn starch and water in a bowl, then add to slow cooker.
Stir in sauerkraut, milk, and corned beef.
Cover and cook on High 4-5 hours.
Season with salt and pepper.