Combine all ingredients in a large pot (that will hold the beef) and cover, and bring to a boil. The liquid should come halfway up the side.
If not add more stock or water. Lower the heat and cook at a simmer for 2 to 2 1/2 hours, turning a few times during cooking.
Turn off the heat and let the roast sit in the sauce on the covered pot for 2 to 3 hours to come to room temperature.
Slice and brush with sesame oil and sauce.