If preparing a pan-seared steak, reserve 1 Tablespoon of the drippings from the steak in the pan. If not, melt 1 Tablespoon butter in a cast-iron skillet or saucepan over medium heat. Add garlic and shallots, and saute for about 1 minute until tender and fragrant.
1 Tablespoon drippings from steak, 1 Tablespoon minced garlic, ¼ cup minced shallots
Add red wine, beef stock, balsamic vinegar, and thyme. Raise the temperature to medium-high heat and bring the mixture to a rapid simmer.
1 cup red wine, 2 Tablespoons balsamic vinegar, 2 sprigs fresh thyme, 1 cup beef stock
The wine sauce will begin reducing and will thicken gradually in 3-5 minutes.
If using fresh thyme sprigs, remove them from the sauce. Turn the heat to low and whisk in additional butter. Let the liquid simmer further.
2 Tablespoons butter
Add parsley, taste, and add additional salt and pepper if desired. Serve, and enjoy!
¼ cup roughly chopped parsley leaves