Thanks to quick reply, here is the update!!!
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STEAK WITH MUSHROOM GRAVY (Jigerschnitzel)

4 pork steaks (boneless)
1 medium onion (sliced)
10 cups water
1 bouillon cube
1 Tbsp cornstarch
1 can sliced mushrooms (4 oz. size)(drained)
2 Tbsp shortening
1 cup sour cream
Salt and pepper

Rub salt and pepper into steaks and brown in shortening in a large
skillet. Remove steaks, add onion to drippings and brown. Then
add mushrooms, water, bouillon cube and steaks. Cover and simmer
for 15-20 minutes. Remove steaks to a platter, mix cornstarch with
sour cream and stir into gravy. Heat, but don't boil, season with
salt and pepper and pour over the steaks.