I made my own (sweet) mincemeat at the beginning of October and when I checked it last week, I noticed that there had been some fermentation of the apple (e.g. sticky liquid bubbling from some of the jars). Does this necessarily mean I can no longer use it, or should it still be safe providing it smells and tastes OK? Apart from cooking a batch of mince pies and (force-)feeding them to my DH to see if they make him ill, I just don't know how to judge it. Any advice much appreciated (especially as we have 50 people coming to a mince pie party on Sunday ....)