You've got Better Homes & Gardens Meals in Minutes (c)'63 to thank for this weeks WTF?!?
Their Grilled Steak Sandwich, started it. You see, they suggest that you grill 1, 1lb 1/4" thick round steak, then cut it in 6 pieces before you, "Dip thick slices of toasty French bread in savory sauce." But if the secret is in the sauce, the secret is out.
1/2 cup butter, melted
3 tablespoons bottle steak sauce [oooh, of choice? yep.]
2 tablespoons sliced green onion [oh, now it's got an Asian flair]
1 1/2 tablespoons Worcestershire sauce
1/4 teaspoon salt
Heat. Dip toast quickly in sauce; top with steak; spoon on remaining sauce.
Thanks for the salt lick, BH&G.