What is the origin of the idiom "keep the pot boiling" and when to use it?

The idiom "keep the pot boiling" has its roots in cooking practices from the past. In traditional cooking, especially in older kitchens, maintaining a constant heat under a pot or kettle was crucial to ensure that the food inside would be cooked properly. Today, this phrase is used to express the idea of keeping an activity, project, or process active or continuing without interruption.