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I am surprised when I hear people saying they've asked
resturaunts to take their food into the kitchen and
prepare it.  I would be very concerned about the kitchen
contaminating the food in a toaster used for wheat
bread.  One friend even told me she takes pasta to an
italian resturaunt and asks them to cook it up.  The
way wheat pasta puts a hard to clean scum on the
sides of pots, I would never trust that they cleaned
it well enough.

On the other hand, I often take food into resturaunts
for my kids.  When the food I ordered arrives, I add
the bread, etc. to the plate myself.  I've never
had a resturaunt complain about this.

I don't think it is unreasonable for a food
establishment to control what goes into their kitchen.
I also would not be at all surprised that they would
be written up by a health inspector (if caught) for
allowing food from an unknown source to be prepared
in their kitchen.
Deborah Fusco, PE
Environmental Regulatory Specialist
Hach Company
Loveland, CO
(970)669-3050