teaspoon flour (use Pillsbury's Shake & Blend Flour for gravies)
Salt and pepper steak and dredge in flour.
Using a skillet, fry steak in oil only until just light brown on each side.
In same skillet add water, ketchup and worcestershire sauce and let simmer on low heat for 15 to 20 minutes.
Add onion rings and simmer 10 minutes.
Push steak and onions to one side in skillet. Using Pillsbury gravy flour, whisk in vigorously while gravy is bubbling and simmer 5 more minutes. (This flour is the secret to not having lumps in your gravy.).