Chawan-mushi (egg custard)

Ingredients:

• 3 eggs
• 2 3/4 cups cooled soup stock [chicken stock + fish-based stock (powdered or liquid form acceptable) + dash of sake and soy sauce]
• 4 slices of gu (filling, such as fishcake, shiitake mushroom, or chicken breast, parboiled)
• 4 cilantro leaves (also known as chinese parsley)