Place a deep cast-iron skillet or heavy-bottomed skillet on the stove over medium heat.
Add the butter to the skillet and allow it to melt completely.
Add the cubed sirloin tips and finely chopped yellow onion to the skillet.
Season the beef and onion with salt and ground black pepper to taste.
Cook for approximately 5 minutes, stirring occasionally, until the beef is browned on the outside and the onion is translucent.
In a medium mixing bowl, combine the condensed cream of mushroom soup, heavy whipping cream, red wine vinegar, and beef with onion soup mix.
Stir thoroughly until the sauce mixture is smooth and fully combined.
Pour the sauce mixture into the skillet with the beef and onion.
Stir until the beef tips are completely coated with the creamy gravy mixture.
Reduce the heat to medium-low.
Cook for 2 hours, stirring occasionally to prevent the sauce from sticking to the bottom of the skillet.
Reduce the heat to low.
Continue cooking for an additional 4 hours, or until the beef tips are very tender and fall apart easily.
If the sauce becomes too thick during cooking, add a small amount of broth, cream, or water as needed to maintain the desired consistency.
Near the end of the beef cooking time, place a large pot of salted water on the stove over high heat.
Bring the water to a boil.
Add the egg noodles to the boiling water.
Cook the egg noodles for approximately 5 minutes, or until al dente, following package directions as needed.
Drain the cooked egg noodles.
Rinse the noodles under cold water, if desired, to stop the cooking process and prevent sticking.
Place the egg noodles on serving plates or in bowls.
Spoon the beef tips and creamy gravy over the noodles.
Serve warm.