Pour cold sake into a shot glass. Add ponzu sauce.
Separate quail egg yolk from egg white.
Carefully add yolk to glass. (Egg white may be reserved for another recipe calling for egg whites.)
Place oyster on top of yolk.
Garnish with chopped green onion
Serve immediately.
Notes
*Ponzu sauce is a classic citrus-soy Japanese condiment. It may be found on grocery store shelves where soy sauce is sold.**Fresh bay scallops, raw and diced, may be substituted for oyster