Cut meat into strips about 1/2 inch thick or into bite size pieces.
Brown quickly in hot fat
Add water and salt and pepper.
Simmer until tender, add more liquid if needed.
Dissolve cornstarch in water and add to meat to thicken stirring constantly
Add sour cream and heat through, do not let boil
Serve with hot rice or noodles
Meat can be prepared early in the day or even the day before reheated and the sour cream added just before serving.