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Adding a tablespoon of vinegar to the cooking water can help prevent eggs from bursting. Vinegar strengthens the skin and reduces the risk of cracking during cooking. And if the skin was brittle, adding vinegar will help keep the egg whites from getting too wet! This will allow the egg white proteins to coagulate more quickly and prevent a disaster. Out of vinegar? No problem! Substitute salt to prevent the shell from breaking.
5) The match trick to keep the egg shell intact