Season the steaks with salt and pepper on both sides.
3 Sirloin steaks, ½ tsp salt, ¼ tsp ground black Pepper
Heat the oil in a heavy skillet over medium heat, then cook the skeets for 4-5 minutes on each side. Lower the heat and add the butter, garlic and rosemary to the skillet.
In a cup, mix Dijon mustard, flour, beef/chicken broth, Worcestershire sauce, salt and pepper. Now, pour the mixture over the mushrooms, stir until thickens.
2 tbsp all purpose flour, 2 cups beef/chicken broth, 1 tsp Worcestershire sauce, ½ tsp Dijon mustard, ½ tsp salt, ¼ tsp ground black Pepper
Serve the mushrooms gravy over the stakes.
Notes
You can save time on prep if you use pre-cut mushrooms.