I've read different things about how long it can last. How far in advance have you made and used the MMF? I have some leftover from mid September that has been in a ziplock and tightly saran wrapped in a cabinet. Should I toss it? My first reaction is Yes. But really what spoils in shortening, marshmallows and sugar?
it'll be rock hard, but a few seconds in the microwave and kneading ( lots of kneading!) and it should be fine! yeah, its hard to go wrong with something like MMF
Not sure about what really spoils in marshmallows, but I went to a store in a town where my daughter lives last night....They had big bags of marshmallow on sale. 3/$1.00!!! Brand name even. Something definitely wasn't right though. They were originally white and now had the tannish brown overcast color which made me think, Wow, maybe they do go bad after all.