Beef Stew

 Combine beef, soy sauce, mirin, sugar, bouillon cubes, and water in a pot to a rolling boil.

Once boiling, lower heat and simmer until beef is tender, about 60 to 80 minutes.

When beef is tender and cooking is almost done, add onions, bell peppers, and sesame oil. Season with salt and pepper. Garnish with sesame seeds, if desired.