It's fun to use pistachios for some of these and pecans for others, but of course you can stick with one or the other. It's best to bake them on a dry day; if it's even slightly humid, the meringues may take longer to crisp in the oven. The meringues can be made up to five days ahead and stored in a cool, dry place.
Full recipe here: http://www.marthastewart.com/1043850/coffee-meringue-acorns
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