Cut the beef into bite-sized pieces.
Boil the beef in a pot with water to remove the blood.
Remove the beef and add fresh water, soy sauce, sugar, garlic, green onion, and pepper.
Simmer over medium-low heat until the beef is tender.
Add quail eggs and shishito peppers, and continue to cook for flavor to absorb.
When the sauce has reduced, it's ready to serve.