In a small skillet, saute onion in oil until tender.
In large saucepan, bring the vegetable and beef broths to a boil. Stir in the horseradish, worcestershire sauce, mustard and celery salt. Add the corned beef, sauerkraut and onion.
Reduce heat to low. Cover and simmer for 10 mins.
Ladle soup into 4 oven-proof bowls. Top each with bread cubes and a slice of cheese. Broil 3-4 inches from heat for 2-3 minutes until cheese is melted.
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