01 - Preheat your oven to 325°F. Position the oven rack in the center position for even heat distribution.
02 - Pat the beef chuck roast thoroughly dry with paper towels. Season all sides generously with kosher salt and black pepper, pressing the seasoning into the meat.
03 - Heat 1 tablespoon sesame oil in a large Dutch oven over medium-high heat until shimmering. Sear the roast on all sides until deep golden brown, approximately 3-4 minutes per side. Transfer 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 slightly softened and fragrant.
05 - In a medium bowl, whisk together soy sauce, beef broth, brown sugar, rice vinegar, gochujang, remaining sesame oil, honey, grated ginger, and minced garlic until the sugar is fully dissolved.
06 - Return the seared roast to the Dutch oven. Arrange the carrots, daikon chunks, and scallion pieces around the meat. Pour the prepared sauce evenly over the roast and vegetables.
07 - Bring the liquid to a gentle simmer over medium heat. Cover the Dutch oven tightly with the lid.
08 - Transfer the covered pot to the preheated oven. Braise for 3 hours, or until the beef is fork-tender and easily shreds apart.
09 - Carefully remove the Dutch oven from the oven. Transfer the roast and vegetables to a serving platter, covering loosely with foil to keep warm.
10 - Skim any excess fat from the surface of the cooking liquid. For a thicker sauce, simmer the liquid on the stove over medium heat for 5-10 minutes until reduced and slightly thickened.
11 - Slice or shred the beef against the grain. Arrange the meat on a platter with the braised vegetables. Spoon the reduced sauce generously over the top. Garnish with toasted sesame seeds and thinly sliced scallions before serving.