01 - Preheat oven to 325°F. Pat the beef roast thoroughly dry with paper towels and season generously on all sides with kosher salt and black pepper.
02 - 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 meat to a plate and set aside.
03 - Add the sliced onions to the same pot and sauté for 2–3 minutes until slightly softened and fragrant, scraping up any browned bits from the bottom.
04 - 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 dissolves and the mixture is well combined.
05 - Return the beef to the pot. Arrange carrots, daikon radish, and scallion pieces around the meat. Pour the sauce mixture evenly over the roast and vegetables.
06 - Bring the liquid to a simmer over medium-high heat. Cover tightly with the lid and transfer to the preheated oven. Braise for 3 hours, or until the beef is fork-tender and easily shreds apart.
07 - Remove the roast and vegetables to a serving platter, tent loosely with foil to keep warm. Skim excess fat from the cooking liquid. If desired, simmer the sauce on the stove over medium heat until reduced and thickened to your preferred consistency.
08 - Slice or shred the beef against the grain. Arrange the meat on plates with vegetables and spoon the reduced sauce generously over the top. Garnish with toasted sesame seeds and thinly sliced scallions.