Do you need vinegar to poach an egg?

Poached eggs have a reputation for being temperamental, which is mostly a reputation for wispy whites drifting around the pan like weather. Vinegar is the classic remedy. It does work, a bit. But it is the third most important thing, and if you get the first two right you may not need it at all.

What vinegar does

Egg white sets when heat makes its proteins unfold and bind together. Acid helps that along. Wikipedia's entry on the poached egg notes that a small amount of vinegar may be added to the water because its acidity speeds up the poaching, which helps limit the white spreading out.

The trade-offs:

• Taste. Too much vinegar and the egg tastes faintly sharp. A small splash in a wide pan of water is plenty.
• Texture. In our experience, a lot of acid makes the outer white slightly tighter and a touch rubbery.
• Choice of vinegar. Plain white wine vinegar or distilled vinegar is neutral. Avoid strongly flavoured or coloured ones.

If you dislike the taste, leave it out and rely on the steps below.

What matters more: a fresh egg

A raw egg white has two parts: a thick, jelly-like white that hugs the yolk, and a thin, watery white that runs off to the edges. Older eggs have more of the runny part. Wikipedia notes that the white of a freshly laid egg is less likely to disperse. It is the thin white that turns into the feathery ribbons in the pan.

How to tell at home: crack the egg onto a plate. A fresh egg sits up tall, with a firm white holding a domed yolk. An older egg spreads wide with a flat yolk. Older eggs are perfectly good for scrambling, baking or a frittata; save the freshest for poaching.

Straining: the best trick

Crack the egg into a fine sieve set over a bowl and let the loose, watery white drain away for a few moments. Gently swirl the sieve if needed. What is left is the firm white around the yolk, which poaches into a neat, compact shape. Wikipedia mentions straining for exactly this reason. Tip the egg from the sieve into a small cup, ready to slide into the water.

You lose a little white this way. It is worth it.

Water, heat and timing cues

• Use a wide, deep pan with enough water for the egg to sink and float without touching the bottom too hard.
• Keep it at a bare simmer. Small bubbles on the bottom, the surface just trembling. A rolling boil tears the white apart.
• Lower the egg in gently from a cup held close to the surface.
• Watch, don't time. It is done when the white is fully opaque and set, and the yolk still wobbles when you lift the egg with a slotted spoon and nudge it.
• Drain well on a folded clean cloth or kitchen paper so it doesn't water down the toast.

The swirl debate

Stirring the water into a whirlpool before slipping the egg into the centre is a popular technique, and Wikipedia notes that a vortex may reduce the white spreading. It can help one egg wrap neatly around itself. The downsides: it only works for one egg at a time, and the egg can still be pulled about if the vortex is too fast. With fresh, strained eggs and gently simmering water, we find the swirl optional. For several eggs at once, skip it and lower them in one after another around a wide pan.

Making poached eggs ahead

For brunch or a crowd, poach eggs until just set, then lift them into a bowl of cold water to stop the cooking. Keep them in the fridge, and use them the same day. To serve, warm them briefly in a pan of hot (not boiling) water until heated through, drain well and serve.

What to put them on

Toast with butter or olive oil, sautéed greens with garlic, a bowl of white beans, asparagus, lentils, a tomato sauce in the style of eggs in purgatory, or a warm grain salad. More ideas in eggs for dinner.