Season the beef cubes with salt and pepper. In a large pot or Dutch oven, heat the vegetable oil over medium-high heat. Add the beef in batches and brown on all sides. Remove the beef and set aside.: The moment the beef hits the hot oil you will hear a lively sizzle and smell that rich, roasted aroma that hints at the depth to come. Browning in batches avoids crowding, which would trap steam and keep the meat from forming a caramelized crust. Aim for a deep mahogany color on each side rather than a pale tan, flipping only when a crust releases easily from the pan. A common mistake is using too cool a pan, which leads to grey edges and more liquid in the pot, diluting flavor. If you notice too much liquid building up, increase the heat slightly and allow it to evaporate before continuing. The browned bits left behind are flavor gold, so don’t wipe the pot clean.
In the same pot, add the chopped onion and cook until translucent. Add the garlic and cook for an additional minute.: As the onion softens it will release a gentle sweetness and the surface will turn glossy, signaling it is ready for the garlic . The brief cooking of the garlic awakens its aroma without risking bitterness, and you should smell a fragrant, toasty note. Stir frequently to prevent sticking, and watch closely because garlic browns faster than onion . If you smell a sharp burnt scent, lower the heat and remove from the pan to cool slightly before proceeding.
Pour in a bit of the beef broth to deglaze the pot, scraping up any browned bits. Add the browned beef back to the pot. Pour in the remaining beef broth, Worcestershire sauce, dried thyme, and bay leaves. Bring to a boil, then reduce heat to a simmer. Cover and let the beef simmer for about 120 minutes, or until it is tender.: When you add the first splash of beef broth , use a wooden spoon to lift the fond stuck to the bottom, and you will see the liquid take on a dark, savory hue; that is the backbone of the broth. Returning the seared beef and adding Worcestershire sauce , thyme , and bay leaves builds complexity. Bring to a vigorous boil to kickstart collagen breakdown, then lower to a gentle simmer where small bubbles rise slowly. You should smell a rounded, concentrated aroma as the hours pass and the beef becomes tender. A common error is simmering too hot, which makes the meat tough. Keep the lid slightly ajar if the liquid threatens to boil away too fast, and check occasionally to ensure steady low bubbling.
In a small bowl, mix the cornstarch and water to create a slurry. Stir this into the pot to thicken the broth slightly.: The slurry should be fully smooth and pour in without showing lumps. As you stir it into the hot broth you will see the liquid transform, going from brothy to glossy and slightly viscous, which helps it cling to the noodles . The scent becomes richer and more concentrated as the sauce thickens. If the sauce thickens too much, add a splash of reserved warm beef broth to loosen it. Avoid adding cornstarch directly to the pot dry, because it will make stubborn clumps that are hard to break up.
In a separate pot, cook the egg noodles according to package instructions. Drain.: When the water reaches a rolling boil, salt it lightly if desired, then add the egg noodles . Watch for the moment they become tender with a gentle bite, that al dente feel ensures they do not collapse when sauced. Drain them promptly and give a quick toss to prevent sticking. Overcooking makes them mushy and unable to hold the sauce, so stir and test frequently in the final minute.
Serve the beef and sauce over the cooked egg noodles. Garnish with chopped fresh parsley.: At service the glossy sauce should coat the noodles, and the fork tender beef should fall apart easily when pierced. The warmth of the bowl will release the herbaceous brightness of the parsley , which cuts through the richness. A frequent oversight is reheating too aggressively, which tightens the meat, so rewarm gently over low heat if needed. Enjoy the interplay of tender beef , silky sauce, and toothsome noodles .