The Delmonico Steak House in New York, established in the 1830's with a life of nearly 130 years, was perhaps the most famous steak house in the U.S. I ran across the recipe for their Delmonico steak, which is a bone-in loin strip just like we deliver.
Season with salt (only) on both sides. Baste with oil or melted butter. Sear on one side in a hot iron skillet, flip and turn the fire off, cover lightly with a sauce of butter, chopped parsley, salt, pepper, and fresh lemon, let rest for 5 minutes. Eat.