Pen Shell with Tom Yum Noodles, Thai Street Food.

The "pen shell adductor muscle" (also known as the scallop muscle) is a part of the scallop (also known as the ark clam or abalone clam). It is located along the edge of the clam and serves to keep the shell tightly closed. This part is popular in cooking because it has a crunchy texture and a good flavo r and it has a sweet, slightly creamy taste with a chewy texture, similar to scallops but tougher. It is popular in various dishes. The adductor muscle can be used in various dishes such as stir-fries, soups, or salads.
Scallops are marine bivalve mollusks found in tropical and temperate seas, particularly in Southeast Asia, where they are popular as a delicious seafood ingredient.