Boil the quail eggs in boiling water for 10 minutes, then peel the shells.
Cut the beef into bite-sized pieces.
Add quail eggs, beef, soy sauce, water, sugar, green onion, garlic, and pepper to a pot.
Simmer over medium heat for 20 minutes until the ingredients are cooked.
Turn off the heat and let it cool, allowing the marinade to soak into the eggs and beef.