J G
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I like to make big batches of mayonnaise in my food processor, and unlike every recipe I've seen which says you can only keep it a week, mine keeps for two months or more in the fridge. The secret? Add several tablespoons of active-culture whey while making it, then, after putting it into your storage container, leave the container out on the counter overnight, refrigerating it in the morning. This turns your mayonnaise from a potential petri dish for bad microorganisms into a filled ecology for good organisms. Since the ecological niche is already filled, bad organisms have a hard time getting in. This makes it not only more convenient, it is a very healthy addition. One thing, though...if you use this to make Waldorf salad, you'll notice the salad tastes slightly fermented on the second day, even if you keep it in the fridge. (Personally, I think that's a plus.)
You get active-culture whey by straining active-culture yogurt through cheese-cloth or other cloth. For mayonnaise, you'll only need several tablespoons, but whey is a great addition to other culturing projects like sauerkraut or kim-chee. It ensures that it works to perfection every time.
Another trick I use for mayonnaise is to use 4/5 olive oil and 1/5 coconut oil. The two flavors balance themselves so that neither is overpowering.