Sauté onion, garlic, celery, green pepper, and green chili in bacon fat: then add tomatoes, sauce, gravy, paste, Tabasco and Worcestershire. Stir, lower the heat and add remaining sauce ingredients, heat through then turn off the heat.
For the meat preparation, remove all bones and fat and cut into serving size pieces, then rub both sides with salt, pepper and flour mixture.
Heat oil in a large skillet and brown steak on both sides, drain.
Preheat oven to 375°F.
Layer half of steak in a large casserole dish, cover with 1/3 of cheese and pimientos. Repeat with the steak, cheese and pimientos, then cover the whole thing with the sauce.