Eggs are the fastest protein in the kitchen and the least respected

The options around cooking eggs are set out side by side below, with the conditions that genuinely favour one over the other.

Two proteins, two setting points

Egg white begins to set at a lower temperature than yolk, which is the whole reason a poached or fried egg can have a firm white and a liquid yolk. Push the temperature higher and both set, then tighten, squeeze out water and turn rubbery. Every classic egg fault, from weeping scrambled eggs to a grey ring around a boiled yolk, is the same overheating story.

The remedy is almost always lower heat and more patience rather than a different method.

Scrambling is a speed choice

Low and slow with constant stirring gives small curds and a creamy, almost saucy result that sets in the residual heat. Higher heat with less stirring gives large soft curds, which is a different dish and equally valid.

On a weeknight, whichever you choose, take the pan off while the eggs still look slightly underdone, because they will finish in the pan. Salting before or after cooking changes the texture slightly, and it is worth trying both to see which you prefer.

Boiling is about the starting temperature

Eggs lowered into already-boiling water cook more predictably than eggs started in cold water, because the timing starts at a known point. Times vary with egg size, starting temperature and altitude, so the first attempt in a new kitchen is a calibration. Cooling in cold water stops the carryover cooking that produces the green-grey sulphur ring on the yolk.

Older eggs peel more easily than very fresh ones, which is a storage fact rather than a technique.

Frying and poaching are surface problems

A fried egg with a crisp lacy edge needs hot fat; one with a tender white needs moderate heat and a lid. Poaching works better with fresher eggs because the white is tighter and holds together instead of feathering. A splash of vinegar in the water helps the white coagulate faster, and straining off the loosest white first helps more.

The water should be barely trembling, since a rolling boil tears the egg apart.

Eggs as the structure of a whole meal

A frittata, a tortilla or a fried rice absorbs whatever vegetables are in the fridge and turns them into dinner. Eggs also thicken sauces and custards, which they do by unfolding and linking together in a network around the liquid. That network breaks and curdles above a fairly narrow temperature band, so custards go gently or over water.

Nine times out of ten, a little starch in a custard raises the temperature at which it curdles, which is why pastry cream tolerates a boil and creme anglaise does not.

Storage and safety

Countries differ substantially on whether eggs are washed at packing and therefore on whether they are refrigerated, so follow the practice where you live. Runny yolks carry a small risk that matters more for pregnant people, young children, older people and anyone immunocompromised. Some countries operate vaccination or assurance schemes that change that advice, so check your own national food safety guidance rather than a recipe.

Cracked or leaking eggs should be discarded regardless of the date on the box.

Side by side

The takeaway

Lower heat than you think, and off the heat before it looks ready.

Get the heat and the salt right and the rest is detail.