Boil corn on the cob for about five minutes, counted from the moment the water comes back to the boil. That is the Delish answer for a fresh ear of sweetcorn in a big pot of salted water. Serious Eats tested the question harder and reached a stranger conclusion. After cooking more than 60 samples, its writer decided the best “boiled” corn is never boiled at all.
Both answers work. They suit different cooks, and the difference comes down to how much attention you want to pay to the pot.
The five-minute boil
Delish keeps it short. Fill the largest pot you own, salt the water heavily, and bring it to a rolling boil. Add the corn in batches of four or five ears so the pot does not crowd. When the water boils again, start a five-minute timer and have tongs ready.
The corn is done when the kernels turn a bright marigold yellow and look a little fatter than they did raw. Delish admits there is no sure sign beyond that, so colour and plumpness are the cues to watch. Lift the ears onto a platter, brush them with melted butter, and season them while they are still hot.
Other recipe sites stretch the window a little either way. Southern Living gives three to five minutes and says never to go past five. Natasha’s Kitchen gives small ears three to four minutes and large ones five to six.
Why so much salt
Delish wants the water to taste close to seawater. Its reasoning is that the salt brings out the corn’s own flavour, and the cooked ear does not end up tasting salty.
The method with no boil in it
Serious Eats starts the corn in cold water and heats it only to 180°F, well short of a boil. The writer found this keeps the kernels plump, juicy, and sweet.
The idea is not new, and Serious Eats says so. Cook’s Illustrated has long given similar advice, and the writer’s own version differs in small details. The writer’s in-laws had a family method too. They dropped the corn into boiling water, let it return to the boil, and then turned off the heat. They claimed it would hold in the covered pot until the next day, and the testing found them close to right.
Natasha’s Kitchen uses a similar trick to keep corn warm. It covers the pot, turns off the heat, and lets the ears sit for ten minutes. It says they can stay in the hot water for up to 30 minutes before serving.
Steam it, or use the microwave
Steaming came out well in the tests. It does involve boiling, but only a small amount of water, which saves time and energy. It also cooks the corn gently enough to keep its sweetness.
The microwave is the method the Serious Eats writer uses most at home, especially for a single ear. Cooked in its husk, the corn steams inside its own wrapping, and side-by-side tests confirmed the results.
Start at the market
Serious Eats says corn quality starts, to a large degree, at the market. It explains that corn loses sweetness once picked, as its sugars turn into starch. Modern hybrids hold their sugar far longer than older varieties did, but the clock still runs. Delish notes that fresh corn also cooks faster than older corn, so shorten the time for a very fresh ear.
To pick a good ear, look at the silks. Serious Eats wants them moist and soft rather than dry and brittle. Do not strip the husk in the shop. Peel back the tip to see the kernels, or feel the ear through the husk for a cob that is solid without being lumpy. Delish looks for ears that feel heavy for their size, with tight green husks.
What to do with leftovers
Delish cuts the kernels off the cob before storing them. Stand each ear on its end and slice downwards with a sharp knife. The kernels keep for three days in the fridge in an airtight container, or up to eight months in the freezer.
If you only want one ear tonight, skip the pot and try the microwave first.
