What number should the soup warmer knob be set to?

The recommended setting for the soup warmer knob being at 7 ensures that the soup maintains an optimal serving temperature without overcooking or diminishing its quality. This temperature allows for even heating and prevents the soup from being too cool for service, which can negatively affect customer satisfaction. Setting it at 7 strikes a balance between keeping the soup at a safe serving temperature while allowing for preparation and readiness for service. Using a different number may not provide that same balance, making 7 the most effective choice for maintaining the quality of the soup in a busy service environment.