I've never used the Wilton buttercream recipe, but I only use unsalted butter for everything-not just baking. I like being able to control the salt level myself. It's actually kind of amusing when I go to a restaurant and try the bread and butter. I'm so used to unsalted butter that I tend to make weird faces until I remember restaurant butter is often salted!
Unsalted butter is probalby fresher anyway. Salt is used as a preservative.
and because of this it is best to use unsalted butter immediately, or freeze it. I tried leaving it in the fridge once - after a few weeks it grew mold spots!
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