What are common mistakes when making Egg foams and meringue?

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Accepted Answer

Any trace of fat or yolk — see above. It's the most common failure and the most absolute. Adding all sugar at once — it deflates the forming foam and produces a flat, dense meringue. Over-whipping past stiff peaks — the foam goes grainy, weepy, and dry. There is no fix. Under-whipping before adding sugar — the protein network isn't developed enough to hold both air and sugar. Using a plastic bowl. Baking meringue too hot — meringue dries slowly at 80–100°C for 1–2 hours. At 150°C it browns and c