Buffington'S Flank Roast
["flank roast", "1 box Lipton onion soup mix", "1/2 c. red wine vinegar", "salt and pepper"]
["Bake 1 hour per pound at 250\u00b0.", "Roast may be any size but still use same amount of ingredients as listed."]
["flank roast", "onion soup", "red wine vinegar", "salt"]