ossobuco wrote:I'm so old that.... we took lunchboxes with sandwiches (aw, baloney!) and cookies/fruit and sometimes a small thermos of soup.
Mayo is famous for going bad, but I've never had it happen, to me as a child or as an adult.
By now maybe they make lunch boxes with thermal type insulation; I suppose that would help, given a sandwich is put in cold in the first place.
I'll do some nosing around online about this.
Like osso...lunch for me meant a sammich in a paper bag. What's desert?
I ate tuna salad, egg salad, all manner of cheese, mayo, mustard.
Never got sick from one of those lunches. There was no air conditioning in school then, you opened a window. Everyone's lunch sat in their paper bags and lunch boxes on the shelf back in the coat room and depened on themselves to keep cool enough to keep from killing us.
I don't remember any of the other kids ever getting sick over their lunch either.
Our immune system is strong enough to withstand 3 or 4 hour old mayo.