Preheat your oven to 350°
Slice your beef into large chunks, dry thoroughly with paper towels and season generously with salt and black pepper
Place a Dutch oven or large oven safe pot over medium heat and add a thin layer of a neutral oil
Working in batches, sear the beef pieces on all sides, transfer them onto a plate and set aside
Add 1 large thinly sliced yellow onion, 1 large thinly sliced leek, 1 large grated carrot, 6 cloves of finely minced garlic and 1 inch of finely minced ginger and sauté for 5-7 minutes or until everything has softened
Stir 1/4 cup of tomato paste, 2 tablespoons of gochujang or sambal, 1/4 cup of brown sugar and 1/2 cup of ponzu into the vegetables
Add 2 cups of beef stock, the seared beef and any drippings on the plate into the Dutch oven
Bring the liquid up to a simmer
Cover the Dutch oven and transfer into a 350° oven on a rack set below center
Braise for 2 to 2 1/2 hours or until the beef is very tender
Shred the beef and enjoy!