Sear the beef cubes in a large pot over medium-high heat.
Add the sliced onions to the pot and sauté until caramelized.
Stir in the minced garlic and cook for another minute.
Pour in the beef broth and Worcestershire sauce, and add the thyme and pepper.
Return the seared beef to the pot and bring to a boil, then reduce the heat.
Cover and simmer for 1.5 to 2 hours, until the beef is tender.
Cook the egg noodles according to package instructions separately.
Add the noodles to the beef mixture and stir in the butter.
Garnish with fresh parsley before serving.
