Meanwhile, in 5-quart Dutch oven, melt 2 tablespoons butter over medium-high heat. Add onion, celery and garlic. Cook 2 to 3 minutes or until vegetables are softened. Stir in beef broth and potatoes. Heat to boiling; reduce heat. Cover; simmer about 15 minutes or until potatoes are tender when pierced with fork. Stir in corned beef, sauerkraut and salt. Cook 3 to 5 minutes, stirring occasionally, until heated through.