Prepare a bowl of ice water and set aside. Bring a pot of water to the boil. Carefully drop the quail's eggs in and boil for 3 minutes. Remove the eggs from the water with a slotted spoon and place into ice cold water. Once they are cold, peel and set aside. (Note: be very careful when handling the quail's eggs – they will be soft and fragile).

Carefully place eggs in a medium-large jar, and combine remaining ingredients. Let marinate in the refrigerator overnight. Serve at room temperature.