Original Philadelphia Cheese Steak Sandwich

1 (24 ounce) thinly-sliced rib eye or eye roll steak
6 tablespoons soy bean oil
Cheese (Cheez Whiz is recommended), American
    or provolone
4 crusty Italian rolls
1 large Spanish onion
Sweet green and red peppers, saut ed in oil (optional)
Mushrooms, saut ed in oil (optional)

Heat a cast iron skillet or nonstick pan over medium heat. Add 3 tablespoons of the oil to the pan and saut the onions to desired doneness. Remove the onions. Ad remaining oil and saut the slices of meat quickly on both sides.

Melt the Cheez Whiz in a double boiler or in the microwave. Place 6 ounces of the meat onto each roll. Add onions, and pour the Cheez Whiz over the top. Garnish with hot fried sweet peppers, mushrooms and catsup.