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Part of the reason that your run-of-the-mill egg cracks so easily is that chickens are given hormones to make them produce bigger eggs with the side effect of thinner shells. I have found that organic eggs crack less easily, but most people don't want to pay 2-2.5x as much for eggs.
Assuming you're talking about the egg cracking from thermal expansion and not hitting the bottom of the pot, you might try the following:
1) Let the egg come to room temperature before placing it in the boiling water
2) Failing that (or instead), temper the egg by placing it in a bowl of warm water before placing it in the boiling water
3) If that doesn't work, try adding some of the boiling water to the bowl of water to further increase the egg's temperature before placing it in the pot of boiling water.
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