Which of the following cooking practices is considered a violation?

Cooking hamburgers to 140°F without a disclosure on the menu is considered a violation because ground meats, such as hamburgers, must be cooked to a minimum internal temperature of 155°F to ensure that harmful pathogens, such as E. coli and Salmonella, are effectively killed. Additionally, not providing a disclosure on the menu fails to inform customers about the cooking practices used, which is important for food safety and customer awareness.

In food safety regulations, it's critical to inform customers if their food is served undercooked, which is why a menu disclosure is necessary when cooking to a temperature below the recommended safe zone. Without this, customers may unknowingly consume undercooked burgers, increasing the risk of foodborne illness.

The other cooking practices listed meet the food safety guidelines, as they involve either safe cooking temperatures or proper disclosures, making them acceptable when preparing food in a way that minimizes risks to public health.