Hello Marmalady....
If your burgers are properly flashed, then chilled within the exceptible time frame, you need not worry to much about the "little nasties" as you put it.
The most important thing I feel is sacrificing...
I good PC burger should be pulled out of the freezer the evening before use.
If frozen in the middle..you will have a grey-chewy mass.
Perform a test first with your staff..frozen verses defrosted.
When you and your staff are...
The Filet Mignon is the "cut" of steak coming from the center of the pismo...
Crushed assorted peppercorns...bluevien cheese, reduced balsamic,fried sage leaves,and oven roast tomato with a touch of demi...(grilled) of course