Mix the beef broth, soy sauce, garlic chili sauce, gochujang, sesame oil, rice wine vinegar, and light brown sugar in a bowl till smooth.
Heat the vegetable oil in a skillet over medium-high. Season your chuck roast with salt and pepper, then brown it on all sides till nice and caramelized.
Transfer the roast to your pressure cooker or slow cooker pot. Pour that sauce mixture all over it.
Seal the pressure cooker with the sealing ring in place. Set on high pressure for about an hour, or if using slow cooker, low for 8 hours.
Listen for the steam cues as the pressure builds—you'll know when it’s ready to quickly release.
Use quick release carefully to let out the steam once cooking’s done. Check if your beef is tender pull ready—if it falls apart with a poke, it’s perfect.
Take out the roast and shred it with two forks, mixing the meat back into the sauce. It gets all juicy and flavorful like that.
To finish, whisk cornstarch and water, then stir into the sauce. Heat till thickened for that amazing coating on your beef.
Notes
You can serve this pot roast with steamed white rice or mashed potatoes topped with some of the sauce.