Pork Liver
["2 lb. pork liver, cut in cubes", "2 Tbsp. fat", "1/4 c. flour", "1 small onion, minced", "2 c. water", "2 Tbsp. vinegar", "salt and pepper"]
["Fry liver in fat very slowly; add flour and onion and cook 20 to 30 minutes.", "Add water, vinegar, salt and pepper and simmer for 10 minutes."]
["pork", "fat", "flour", "onion", "water", "vinegar", "salt"]