Final answer:
A foodservice operation must inform its customers when the sushi it serves is raw due to the health risks associated with consuming raw fish, which can contain harmful parasites.
Step-by-step explanation:
You asked whether a foodservice operation must inform its customers when the sushi it sells is served cold, raw, fried, or grilled. The most important thing to inform customers about is when the sushi is served raw. This is significant for health reasons, as raw fish can contain worms and larvae that are harmful to humans. Freezing or cooking fish to very low or high temperatures, respectively, are methods that kill these parasites, ensuring the safety of the seafood. While consuming raw sushi can be enjoyable, it does come with some risk of infection. Therefore, it is essential for foodservice operations to alert their customers when they are being served raw sushi to make an informed decision about their meal.