Place flour in a shallow dish and season with salt and pepper.
In another dish, whisk together the buttermilk, the egg, and the remaining dry ingredients.
If desired, sprinkle the steaks with a little bit of steak seasoning, then dredge them in the flour.
Dip each steak into the buttermilk mixture, then once again into the flour, completely coating the steaks.
In a deep cast-iron skillet over medium heat, heat the shortening to about 340 degrees. There should be enough shortening (2 to 4 inches) to almost cover the steaks and allow them to float.
Fry the steaks, gently turning every so often, until golden brown, about 6 to 7 minutes (don’t crowd the skillet; you can fry in batches, just be sure to bring your shortening back up to temperature).
Drain on a wire rack and keep warm in a low oven while you whip up some cream gravy. Serve immediately—they lose their luster rather quickly.