Putting butter on the sandwich keeps the bread from soaking up the mayonnaise or dressing. That could be the reason on those pre-mades, but I don't know about the ones that are to be eaten at the deli.
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Greg
A pessimist is an optimist with experience.
"In my many years I have come to a conclusion that one useless man is a shame, two is a law firm and three or more is a congress." - John Adams
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