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As long it is stored in a cool, dry place, cocoa powder can last up to 2 years.  If the cocoa seems lumpy, run it through a sifter before using.

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If you sift the flour and cocoa together for a recipe, you get rid of the lumps and combine the dry ingredients at the same time.

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The term “Dutch process” on a cocoa package means it has been treated with an alkaline solution.  This cocoa has a darker color and more mellow taste, but can be used interchangeably with regular powdered cocoa unless the recipe directs otherwise.