Quote:
Originally Posted by Chicharronita 
But what else in the recipe is supplying the good bacteria?
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The mayo is naturally fermenting and the fermentation process supplies the good bacteria. When I make sauerkraut, all I use is cabbage and salt ... and yet, it turns into a probiotic packed crock of bacterial goodness. You only need to ensure that whatever you are fermenting doesn't rot (bad bacteria taking over) before the good bacteria get a chance to multiply and take hold. The whey acts in the same way that the salt does, only it gives the mayo (or whatever you are adding it to) a leg up, so to speak, in that it already contains plenty of the good bacteria, so there's more of a chance for them to take hold and start multiplying immediately.
Again, I have to say that whey is completely unnecessary in most ferments. I much prefer Sandor Katz's recipes to Sally Fallon's when it comes to fermentation, and hardly any of his recipes call for whey (or for brine from other lacto-fermented foods, for that matter).