1. Place corned beef brisket in water-soaked clay pot. Sprinkle with seasonings included with meat; add onion. Cover with water-soaked lid.
2. Microwave 30 minutes on MEDIUM (Simmer). Turn brisket over; add cabbage and recover. Continue cooking 60 to 65 minutes on MEDIUM (Simmer), or until meat is fork tender. Let stand, covered, 5 minutes before serving.