Cut the beef into appropriate-sized pieces.
Soak the beef in cold water to remove blood.
Place the beef and water in a pot and bring to a boil.
When it starts boiling, remove any foam that forms.
Add soy sauce, sugar, minced garlic, whole black peppercorns, onion, and green onion, then simmer over low heat.
Boil the quail eggs and peel off the shells.
When the beef becomes tender, add the quail eggs and shishito peppers and continue simmering.
When the broth has reduced, turn off the heat and let it cool.