In the event that a customer with a severe peanut allergy places an order for a Whopper with mayonnaise, our staff will follow strict protocols to guarantee their safety and minimize the risk of cross-contamination. Firstly, our team member will politely inform the customer about the presence of mayonnaise in the burger, which contains trace amounts of peanuts due to its production process. If the customer affirms their allergy, we will ask them to confirm whether they have an epinephrine auto-injector (EpiPen) on hand. This is critical as prompt administration of epinephrine is vital in managing a severe allergic reaction. We will then request that our kitchen staff use separate utensils, equipment, and work surfaces to prepare the burger. They will also wear gloves and a clean apron to prevent any potential cross-contamination from other orders containing peanuts or mayonnaise. Moreover, our team members will thoroughly clean all surfaces, utensils, and equipment that came into contact with the allergen before proceeding with the preparation of the customer's meal. We will also double-check the ingredients list to ensure that no other allergens are present in the order, besides peanuts. Our staff is trained to handle food allergies with extreme caution and sensitivity, as we understand the potentially life-threatening consequences that may arise from an allergenic reaction. In case of any emergency, our team members will immediately call 911 and provide first aid until medical assistance arrives.