Ingredients

• Ingredients
  1. 2 tablespoons extra-virgin olive oil
  2. 1 onion, thinly sliced
  3. 8 ounces cremini mushrooms, thinly sliced
  4. 1 teaspoon chopped thyme
  5. Kosher salt and freshly ground pepper
  6. 1 cup reserved gravy from Coriander-Dusted Roast Beef or other beef gravy
  7. 1/4 cup sour cream
  8. Buttered noodles, for serving
  9. Half of the Coriander-Dusted Roast Beef or 12 ounces roast beef, sliced 1/4 inch thick and cut into strips

Directions

1. In a large skillet, heat the olive oil until shimmering. Add the onion, mushrooms and thyme, season with salt and pepper and cook over moderate heat, stirring occasionally, until tender and browned, 8 minutes. Add the gravy and bring to a boil. Stir in the sour cream. Add the beef and simmer until heated through, about 2 minutes. Serve over buttered noodles.