How come egg whites whip up best in a copper bowl?
When you use a metal whisk in a copper bowl, you are creating an electrostatic force that reduces both the time and the energy needed to whip up perfectly fluffy whites. The copper helps stabilize the egg whites as well, but a pinch of cream of tartar will do the same job. If you don’t have a copper bowl available, stainless steel is the next best thing.
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