In a skillet over medium high heat, brown the beef and onions quickly in hot oil. Transfer to the crock pot; add vinegar to skillet and scrape browned bits up with a spatula; add to crock pot. Add potatoes and corn, then sprinkle with gravy mix; pour water over all and mix to combine. Cover and cook on low for 7 to 9 hours. Taste and adjust seasonings. Serves 4 to 6.
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