Final answer:
The chef's corrective action was reheating the soup to 165 degrees F for 15 seconds, to ensure it surpassed the critical temperature limit for safe consumption.
Step-by-step explanation:
The corrective action taken by the chef was to reheat the minestrone soup to 165 degrees F for 15 seconds. In food safety, it is important to ensure that food being held for service is kept above the operation's critical limit, which in this case is 135 degrees F, to prevent the rapid multiplication of microorganisms.
By reheating the soup to 165 degrees F, the chef effectively raised the temperature of the soup past the critical limit, thus reducing the risk of foodborne illness. Serving hot food at the proper temperature is a crucial step in maintaining food safety standards.