Which of the following does NOT require a variance?

The process of smoking food for flavor does not require a variance because it is a traditional cooking method that falls under standard food preparation practices recognized by regulations. The guidelines for food safety and food preparation include allowable methods that enhance flavor without posing significant health risks. These methods are commonly accepted and do not typically necessitate special permission or a variance, as they are part of established cooking techniques.

In contrast, the other options involve processes that can significantly affect food safety and may require special handling or monitoring. For instance, acidification of sushi rice is crucial to prevent the growth of harmful bacteria, especially if not monitored correctly. Similarly, sprouting beans or seeds involves conditions that can lead to bacterial growth if not managed properly. Custom processing of animals goes beyond standard operating procedures and often involves various safety considerations that might necessitate a detailed variance application to ensure compliance with health regulations.