Make the equipment ready
Bring the unit up to temperature before food goes in.
The unit's temperature is shown and recorded before loading.
Food goes into a cold bain marie to warm up together.
A holding unit keeps hot food hot. It isn't made to heat food, so food enters already at temperature. Check how your law words the floor. Australia says 60 °C or hotter. Malaysia, Singapore's guideline and New Zealand's template say above 60 °C.