After you sear the steaks and remove them from the pan, do not wash the pan. We will make our sauce right in the same pan.
Before you begin, prepare the aromatics and measure the other ingredients. Peel and smash the fresh garlic clove. Cut the mushrooms into quarters.
Set pan over medium-high heat. Add 1 tablespoon of butter.
When the butter is melted and bubbly, add the shallot, garlic cloves, mushrooms, rosemary, and thyme.
After the aromatics have toasted for 2 minutes, add the red wine. Scrape up the browned bits from searing the steaks. Cook the red wine for 4-5 minutes.
Next, you can add the beef stock and bay leaf.
Lower the temperature to medium heat and cook the sauce for 10 minutes or until it has reduced by more than half.
Remove the herbs and aromatics. You can do this by pouring the sauce through a strainer and returning the sauce back to the pan or you can use tongs to remove each item piece-by-piece. Continue reducing the sauce until its about a half of a cup in volume.
When the sauce has reduced, turn off the heat. Season the sauce with pepper and check for salt.
Last step, whisk in the other tablespoon of butter and transfer to a serving dish.