Preheat oven to 350 degrees.

Cut round steak into serving pieces (approx 10- remember each piece will become slightly "larger" after being flattened out by pounding). One at a time, lay each piece of meat between plastic wrap. Pound with flat side of meat mallet until flattened and thinned down and tenderized. Repeat process for each piece of meat. Salt and Pepper each piece of meat, then dredge/fully cover each piece (all sides) in flour (put flour on a dinner plate to do this).

Heat oil on medium high heat. Once hot, brown meat (turning once) until browned on both sides. (You may need to cook the meat in batches, depending on quantity and size of skillet). When done, reserve 1/4 cup of the oil and drippings in skillet ; discard the rest of oil.

Place browned meat pieces in a single layer in casserole dish. Top each piece of meat with a slice of onion. Add another layer of meat, then onion, until all pieces are in dish.

Make a really thin gravy by adding 4 cups water to 1/4 cup of oil/pan drippings remaining in skillet. Mix 1 cup water with 3 HEAPING Tablespoons flour. Mix well, then add to skillet and whisk to combine. Season this thin gravy to taste with additional salt and pepper. Bring "gravy" to a boil. It will slightly thicken. Remove "gravy" from heat, and carefully pour it over meat.

Cover dish with lid or tightly cover with aluminum foil. Bake at 350 degrees for 1 1/2 hours.

Remove from oven when done. Serve meat, topped with onions and gravy... and enjoy!