01 - Preheat your oven to 325°F. Position the rack in the center position for even heat distribution.
02 - Pat the beef chuck roast thoroughly dry with paper towels. Season all surfaces generously with kosher salt and black pepper, pressing the seasoning into the meat to adhere.
03 - Heat a large Dutch oven over medium-high heat. Add 1 tablespoon of oil and carefully place the roast in the pot. Sear on all sides until deep golden brown, approximately 3-4 minutes per side. Remove the seared roast to a plate and set aside.
04 - Add the sliced onions to the same pot and sauté for 2-3 minutes, stirring occasionally, until they begin to soften and release their fragrance.
05 - In a medium mixing bowl, whisk together the soy sauce, beef broth, brown sugar, rice vinegar, gochujang, sesame oil, honey, grated ginger, and minced garlic until the sugar is completely 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 and over the meat. Pour the prepared sauce mixture evenly over the roast and vegetables.
07 - Place the pot over medium heat on the stovetop and bring the liquid to a gentle simmer. Once bubbling, cover tightly with the lid.
08 - Transfer the covered pot to the preheated oven. Cook for approximately 3 hours, or until the beef is fork-tender and easily shreds apart.
09 - Carefully remove the pot from the oven. Transfer the roast and vegetables to a serving platter, tenting with foil to keep warm. Skim any excess fat from the surface of the cooking liquid. For a thicker sauce, simmer the liquid on the stove over medium heat until reduced to your desired consistency.
10 - Slice the beef against the grain into thick slices, or shred it with two forks. Arrange the meat on plates with the tender vegetables. Spoon the reduced sauce generously over the top. Finish with toasted sesame seeds and fresh sliced scallions.