You can cook poached eggs in different ways. It is traditional to cook in boiling water with vinegar. But if you want the egg to be a certain shape, you can make a poached egg in a muffin tin. The main thing when preparing this dish is that the eggs must be fresh, no older than three days. There is a simple way to check the freshness of eggs: pour water at room temperature into a cup and lower the egg into it - the fresh one will remain at the bottom of the cup, the stale one will remain in the middle, and the rotten product will float to the surface.