What's the most effective way to mix a jar of natural peanut butter?
I've done this with almond butter, and I imagine it would work for peanut butter as well. The secret is to buy it a month or so before you need it, and then store it upside down for a week, so the oil traverses all the way through the jar and its contents, then turn it right way up for another week, and repeat again in each direction. Each trip through the jar mixes the oil with the solids a little more, and it's fairly homogeneous after four turns.