Sweet Corn
Sweet corn (Zea mays var. saccharata or rugosa) is a variety of corn bred specifically for high sugar content and eaten fresh as a vegetable, unlike field corn or dent corn, which is dried and processed into flour, feed, or ethanol. Sweet corn is harvested while the kernels are still immature and full of milky liquid, which is what gives it its characteristic sweetness and crunch.
Varieties
Sweet corn comes in several breeding types with different sugar levels and shelf lives: sugar-enhanced (se) varieties are tender and moderately sweet with a short window of peak flavor, while supersweet (sh2) hybrids hold their sugar and crispness for days longer after picking. Yellow, white, and bicolor ears are largely a matter of variety and appearance rather than sweetness.
Buying tips
Choose ears with tight, bright green husks and moist, slightly sticky brown silk, not dry or black. Peel back a bit of husk to check that kernels are plump, tightly packed, and milky when pierced with a fingernail; shriveled or dented kernels mean the corn is past its prime.
Substitutes
Frozen corn kernels — 1:1
Frozen at peak ripeness so flavor is close to fresh; thaw and pat dry before adding to salads or salsas so excess water doesn't dilute the dish.
Canned corn, drained — 1:1
Softer texture and a slightly saltier, less crisp bite than fresh, but works fine in chowders, casseroles, and cornbread.
Cooked hominy, chopped — 1:1 by volume
Different flavor (nixtamalized corn, more savory and chewy) but a reasonable textural stand-in in soups like posole or corn chowder.
Diced yellow summer squash or zucchini — 1:1 by volume
Not a flavor match at all, but useful for adding a similar pop of color and mild sweetness to salads or salsas when corn isn't available.
Storage
Sweet corn's sugars begin converting to starch the moment it's picked, so it's best used within a day or two. Keep ears unhusked in a loosely closed plastic bag in the refrigerator crisper drawer. To freeze, blanch shucked ears for about 4 minutes, cool in ice water, then cut kernels off the cob and freeze in an airtight bag for up to 8 months.
How to use
Boil for 5-7 minutes, grill in the husk over medium heat for about 15 minutes turning occasionally, or roast husked at 425°F for 20-25 minutes. Cut kernels off the cob raw for salsas and salads, or cook them into chowders, cornbread, fritters, and succotash.
What it pairs with
Pairs well with butter, lime juice, chili powder, and cotija cheese in elote-style preparations, and with tomatoes, basil, black beans, bacon, and smoked paprika in salads and chowders.
Nutrition
A medium ear provides around 3 grams of fiber and a good amount of vitamin C and B vitamins, plus lutein and zeaxanthin, antioxidants linked to eye health. It's naturally higher in sugar than most vegetables but still moderate in calories, roughly 90 per ear.
FAQ
Does corn keep getting sweeter after it's picked?
No, the opposite happens. Enzymes in the kernel convert sugar to starch as soon as the ear is picked, which is why corn eaten the same day it's harvested tastes noticeably sweeter than corn that's sat for a few days.
Can you eat sweet corn raw?
Yes. Fresh, high-quality sweet corn is tender and sweet enough to eat raw straight off the cob or shaved into salads and salsas without cooking.
Why do some ears have white and yellow kernels mixed together?
That's a bicolor variety, a cross between white and yellow sweet corn types, bred mainly for appearance and a slightly milder flavor than pure yellow corn.
Is sweet corn genetically modified?
Some sweet corn varieties sold fresh are GMO (engineered for pest resistance), but many are not; if it matters, check the label or ask at a farmers market, since organic sweet corn is never genetically modified.
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