Cooked Pinto Beans For 100
["8 lb. dry beans, washed and picked through", "water", "3/4 c. vinegar", "seasoning as desired (chile, onion, etc.)"]
["Cook", "at", "400\u00b0 in large roaster.", "Cook about 4 hours or until soft."]
["dry beans", "water", "vinegar", "onion"]