Static Now Function

Hi...

Struggling.

I'm working with chefs to create a log of events during dinner service. i.e. When the starter goes out a box is ticked and the time now() is logged. However, when the box for the main course is ticked the now() time value for the starter becomes the same as the time for the main course.

Basically, I want each now() event to remain static and not to update. There are 100 now events on the sheet and they must all remain individual value that will never be updated by anything else that happens on the sheet.

Is it doable?

Thanks. G