01 - Preheat your oven to 325°F. Position the rack in the center position for even heat distribution.
02 - Pat the beef chuck roast completely dry with paper towels. Sprinkle kosher salt and black pepper evenly over all sides of the meat, pressing gently to adhere.
03 - Heat a large Dutch oven over medium-high heat. Add 1 tablespoon of oil (from the measured sesame oil) and sear the roast on all sides until deeply golden brown, approximately 3 to 4 minutes per side. Transfer the browned roast to a plate and set aside.
04 - Add the sliced yellow onion to the hot pot. Sauté for 2 to 3 minutes, stirring occasionally, until the onion begins to soften and releases its fragrance.
05 - In a medium bowl, whisk together the soy sauce, beef broth, brown sugar, rice vinegar, gochujang, remaining sesame oil, honey, grated ginger, and minced garlic until the sugar is fully dissolved and the mixture is uniform.
06 - Return the seared beef to the Dutch oven. Arrange the carrots, daikon chunks, and 2-inch scallion pieces around the roast, distributing them evenly.
07 - Pour the prepared sauce mixture over the beef and vegetables, ensuring the roast is partially submerged.
08 - Bring the liquid to a gentle simmer over medium heat. Cover the Dutch oven tightly with its lid.
09 - Transfer the covered pot to the preheated oven. Braise for 3 hours, or until the beef is fork-tender and easily shreds apart with minimal resistance.
10 - Carefully remove the Dutch oven from the oven. Transfer the roast and vegetables to a warm serving platter, tenting loosely with foil to retain heat. Skim any excess fat from the surface of the cooking liquid. For a thicker sauce, return the pot to medium-high heat and simmer for 5 to 10 minutes until slightly reduced.
11 - Slice the beef against the grain into ½-inch thick slices, or shred it using two forks. Arrange the meat on a serving platter surrounded by the tender vegetables. Spoon the reduced sauce generously over the top.
12 - Sprinkle the toasted sesame seeds and thinly sliced scallions over the dish immediately before serving.