In a frying pan, take 2 tbsp of mustard oil and when the oil is hot, fry the mutton liver pieces over medium to high heat. Since they are small cubes, it takes about 5 to 8 minutes (depending on the size of the pieces and the thickness of your frying pan) for the liver pieces to be cooked. Sprinkle some salt over them. We don’t want to over cook them since liver becomes quite chewy and dry when over cooked. Once done, using a slotted spoon to drain out the oil and keep the cubes aside.