It is safe, most mayo these days in full of preservatives and things that will prevent it from becoming harmful. It can still spoil, of course. and then there is the fact that its nasty in the microwave.
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mayonnaise can be microwaved as the microwaves heat the water not the substance however the raw eggs in it may be an issue as it is possible it may cause salmonella or something also never reheat it more than once or the bacteria will make it go off
Microwave is a great source for heating foods quickly. If you have a recipe that requires heating mayonnaise in the microwave, it is safe to do so. However, do not leave the food out for a long period of time. If you're heating your mayonnaise to complete a meal or recipe, add the mayonnaise shortly after heating it and serve.
Mayonnaise is raw egg and oil mixed together to form the consistency known to us all. Heating would not be appropriate for its use. It is not harmful but would not taste good.
Not supposed to. However, a number of people have used mayonnaise in place of shortening to fry Sandwiches.
Yes, so long as the sandwich is eaten immediately afterwards - i.e don't let it rest on the side for a few hours then eat it (you may get food poisoning).