What is cream of tartar? And do I really need it to whip egg whites?
https://www.kingarthurbaking.com/blog/2023/02/27/what-is-cream-of-tartar
webFeb 27, 2023 · Despite its slightly misleading name, cream of tartar, also known as potassium bitartrate, is an acid salt. A fine white powder you’ll often find in the spice aisle of the grocery store, it’s a byproduct from the fermentation stage of wine, where it crystallizes inside wine barrels.
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