While preparing gravy and searing sirloin, boil the noodles according to package instructions.
Add cooking oil to a large skillet set over medium high heat and sear sirloin chunks until well browned and beginning to char slightly. Remove the beef from the skillet and set aside.
Reduce the heat to low and melt the butter. Then sprinkle in flour to form a roux. Mix continually to prevent the roux from burning until it begins to turn nutty in color, approximately 3 minutes.
Slowly dribble in beef broth while continuing to stir, ensuring it fully incorporates before any additional liquid is added. Continue to add liquid until all beef broth, Worcestershire, and soy sauce have been added. Scrape loose any browned bits on the bottom of the pan and let incorporate into the gravy.
Add fresh ground pepper and sage leaves to the gravy and let gently simmer for 10 minutes, or until it has thickened enough to coat the back of a spoon. The sage leaves can be removed.
Once the gravy has thickened to your liking, taste for salt and adjust if needed. Add sirloin chunks to the gravy and stir to combine.
Serve by placing a bed of egg noodles on a plate and top generously with sirloin chunks and gravy.