01 - Whisk together soy sauce, brown sugar, water, rice vinegar, sesame oil, grated ginger, minced garlic, gochujang, and grated pear in a medium bowl until sugar dissolves completely and mixture is smooth.
02 - Place beef chunks in a single layer at the bottom of the crock pot. Pour the prepared sauce evenly over the beef, turning pieces to ensure thorough coating on all sides.
03 - Cover and cook on low heat for 6 to 7 hours until beef is fork-tender and easily shreds apart.
04 - Transfer beef to a cutting board or large plate. Use two forks to pull meat apart into shreds, removing any excess fat or connective tissue.
05 - Skim any excess fat from the cooking liquid. Whisk cornstarch with cold water until smooth, then stir into the sauce. Return shredded beef to the pot and toss to coat.
06 - Cook on high heat for 15 minutes, stirring occasionally, until sauce reaches desired consistency and coats the beef generously.
07 - Spoon beef and sauce over warm cooked rice. Garnish generously with sliced green onions and toasted sesame seeds before serving.