Heat oil in a large skillet. Add diced onion and tomato and cook for approximately 3 minutes, or until soft. Add garlic and cook for another minute. Add canned beef to the skillet. Use fork to break up the beef. Fry until the beef begins to caramelize, about 5 minutes. Stir in ketchup, then cook for another minute.
Toast sliced bread of choice. Spread on some mustard (optional), then add cooked corned beef. Top with cooked cabbage (optional).
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