In a large nonstick skillet over medium heat, heat oil and butter to hot, but not smoking. Meanwhile, rub the garlic clove over the surface of the steak.
When oil and butter are hot, carefully place the steak in a skillet and brown quickly. Turn steak and brown second side. Reduce heat and continue to cook to desired doneness. A few mushrooms may be added just before done to increase flavor. Remove steak to heated platter.
Increase heat and scrape browned bits on bottom of pan to loosen, and place about once cup water in skillet. Season to taste with salt and pepper. Bring to boil.
Meanwhile, combine 1/2 cup water and 3 to 4 tablespoons flour to a smooth paste. Stirring broth constantly, using a whisk, pour flour mixture into bubbling broth. Whisk quickly and stir continually until gravy forms. Serve immediately. Enjoy!