Ribeye (Cowboy) steak in a pan

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Hi. I cooked a classic Cowboy (Bone-in-ribeye) steak for you today. Fragrant butter was a nice addition to the recipe.
Recipe:
Butter with mushrooms (180 grams pack).
You should fry champignons or porcini mushrooms (100 grams) in a well heated pan together with one medium-sized onion. My recommendation is to use Pomace olive oil (refined). After the onion became caramelized and the mushrooms have lost most of the moisture, add salt and black pepper. You need more salt than usual, as we are going to mix unsalted butter with mushrooms and the taste may be lost. After that, if you are satisfied with the taste, blend the mushroom mixture and mix it with a pack of butter. Pack it in food film and twist it like a sausage. Then put it in a freezer for 2-3 hours. After that time - it will be easy to cut it into neat rounds of correct shape.