Shellfish preparation involves several key steps to ensure safety and enhance flavor. First, it's important to clean the shellfish thoroughly under cold running water to remove any sand or debris. For mollusks like clams and mussels, soaking them in fresh water for about 20 minutes can help expel any remaining grit. After cleaning, shellfish can be cooked in various ways, including boiling, steaming, or grilling. Cooking times vary; for example, shrimp typically take just a few minutes, while lobster may require longer. Always ensure shellfish are cooked until they are opaque and firm to ensure they are safe to eat.