Hold the shell with the flat side facing down, and insert a table knife. Slide the knife along the bottom shell a little at a time. Open the shell so that the curved part is facing down, and release the meat from the shell with the knife, being careful not to damage the adductor muscle.

Remove the digestive gland and frill attached to the adductor muscle. Also use a bamboo skewer or similar to remove the string-like portion around the adductor muscle.