Final answer:
The chef should use pasteurized eggs for the tiramisu to prevent foodborne illnesses, as they eliminate bacteria that raw eggs may contain. Pasteurization is essential for food safety, especially in sensitive environments like nursing homes.
Step-by-step explanation:
To ensure the safety of the tiramisu served at a nursing home, the chef should use pasteurized eggs in the recipe. Raw or unpasteurized dairy products, including eggs, can contain harmful microorganisms that are particularly dangerous for the elderly or those with weakened immune systems. Using pasteurized eggs minimizes the risk of foodborne illness as the pasteurization process involves heating the eggs to a specific temperature to kill bacteria without cooking the egg.
Considering the vulnerability of the nursing home residents to infections and the fact that tiramisu includes components that are typically uncooked, like eggs in the mascarpone cheese mixture, using pasteurized eggs is a critical safety precaution. If a vegan option is desired or required due to dietary restrictions, using vegan substitutes is also a viable option as these products are designed to be safe for consumption without the need for cooking.