Step 1: Understanding the Concept:
Beche-de-mer (also known as trepang or gamat) is a processed, dried seafood delicacy highly valued in Asian markets.
Step 2: Detailed Explanation:
It is prepared by eviscerating, boiling, cleaning, and drying the muscular body wall of marine echinoderms known as sea cucumbers (Class Holothuroidea).
Sea urchins are harvested primarily for their gonads (uni), and body oils are liquid lipid products.
Step 3: Final Answer:
Therefore, Beche-de-mer is a processed product prepared from sea cucumbers.