Final answer:
If a customer with a nut allergy receives an order with nuts, apologize and offer to remake the order. Explain that all dishes in the restaurant could be cross-contaminated with nuts. Do not blame the customer for ordering a dish with an allergen.
Step-by-step explanation:
If a customer with a nut allergy receives his order with nuts on top, the appropriate action to take would be to apologize and offer to have the kitchen remake his order immediately. This is important because nut allergies can be severe and even life-threatening, so it is crucial to address any mistakes promptly and ensure the customer's safety.
Additionally, it would be helpful to explain that all dishes in the restaurant could be cross-contaminated with nuts. This information is important for the customer to know so they can make informed decisions about what they order in the future.
Lastly, it is not appropriate to explain that the customer shouldn't order a dish with an allergen on it as this places the blame on the customer. Instead, the focus should be on the restaurant's responsibility to provide a safe dining experience for customers with allergies.