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Plain frosting is best piped or spread right away. Frosted desserts keep covered in the fridge for up to 2 days.
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To make it ahead or use it in a layer cake, beat in 1–2 tablespoons of instant pudding mix with the cocoa and sugar. Refrigerate covered for up to 1 day and whisk briefly before piping.
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Grainy? Gently fold in 1–2 tablespoons of cold heavy cream by hand.