Sirloin Steak with Bourbon Onion Sauce

For the Sauce:

Melt 2 tbsp. butter in a large skillet over medium low heat. Add the onions and cook about 12 minutes until golden and tender, stirring occasionally. Add the vinegar and boil until reduced by 1/2. Add beef and chicken broths and boil about 10 minutes until the sauce is slightly thickened.

For the Steak:

Heat the oil in a large skillet over medium high heat. Season the steaks all over with salt and pepper then add to the skillet. Cook the steaks about 4 to 5 minutes per side for medium rare. Transfer the steaks to a plate and tent with foil.

Add the bourbon to the skillet and boil until most of the liquid is evaporated. Add the sauce and bring to a boil. Remove the skillet from the heat and whisk in the butter. Divide the steaks between plates, spoon sauce over and serve.