Cut the beef into suitable bite-sized pieces.
Put the beef and water into a pot and bring to a boil.
Skim the foam and remove the boiled beef pieces.
Place the boiled beef back in the pot and add soy sauce, sugar, garlic, green onion, and water.
Simmer on medium heat until the flavors are well absorbed.
Add quail eggs and shishito peppers and continue boiling.
Cook down until the sauce is reduced and slightly thick.