In a large skillet or grill pan, heat the olive oil over medium-high heat. Season the steaks on both sides with a little sea salt and black pepper. Sear the steaks for 3-4 minutes on each side or until they have reached desired level of doneness. Remove the steaks from the pan, and place on a plate covered with foil while you make the sauce. Alternately you can hold the steaks in the oven on low.
To the skillet, add the shallots and butter and sauté until the shallots are soft and translucent. Add the balsamic vinegar, beef broth, and mustard to pan. Use a rubber spatula to scrape any bits of steak from the bottom of the pan and mix into sauce. Bring to a boil over medium heat and then reduce heat to low and simmer 5 minutes.
Pour the sauce over top of the steaks before serving.
Keywords: steak recipe, pan sauce, keto steak recipes, how to make pan sauce, keto recipes, low carb recipes