Which method is not safe for cooking meat?

Cooking meat directly from frozen is considered an unsafe method primarily due to the temperature control required to ensure food safety. When meat is cooked from a frozen state, the outer layers may reach a safe temperature and appear cooked, while the internal parts may remain at temperatures conducive to bacterial growth for too long. This uneven cooking can result in foodborne illnesses as harmful bacteria that may be present in the meat are not adequately killed.

Grilling, boiling, and baking are safe cooking methods when done correctly, as they allow meat to reach sufficient temperatures throughout, ensuring that any potential pathogens are effectively killed. These methods typically promote even cooking, which is essential for food safety. Thus, cooking meat from a frozen state does not provide the same assurance and can pose a significant risk.