Freezing Sweetcorn
General preservation or storage guidance
Blanching whole-kernel sweetcorn briefly before freezing helps retain its quality; cut the kernels from the cob after cooling.
Method
- Choose freshly picked, tender sweetcorn at the milky stage. Remove husks and silks, trim the ends and wash the cobs.
- Bring a large pan of water to a rolling boil and blanch whole cobs for 4 minutes. Blanch only a few cobs at a time so the water returns quickly to the boil.
- Cool the cobs promptly in cold water, then drain. Cut kernels from the cob at about two-thirds of their depth; do not scrape the cob.
- Pack kernels into freezer-safe containers, leaving about 1 cm headspace in rigid containers. For cream-style corn, use a tested preparation rather than scraping kernels into an improvised pack.
- Seal, label and freeze promptly. Keep frozen and use in cooked dishes; thaw only the portion needed.
Storage
Freezer at −18°C or colder · Keep continuously frozen; no exact quality period stated
Sources and scope
- Freezing Corn — National Center for Home Food Preservation
Method-specific source recorded in the prior content audit
NCHFP Pickled Corn Relish (Mixed Vegetables) for Sweetcorn
Complete procedure from the cited tested source
A complete tested mixed relish containing sweetcorn, peppers, celery and onion. This is a different preparation from plain pickled corn; use the source quantities and process without substitutions.
Method
- For about 9 US pints, measure 10 US cups fresh whole-kernel corn (or six 10-ounce packages frozen corn); 2½ cups diced sweet red pepper; 2½ cups diced sweet green pepper; 2½ cups chopped celery; 1¼ cups diced onion; 1¾ cups sugar; 5 US cups vinegar labelled 5% acidity; 2½ tablespoons canning or pickling salt; 2½ teaspoons celery seed; 2½ tablespoons dry mustard; and 1¼ teaspoons turmeric. Do not change proportions or batch size.
- If using fresh corn, boil the ears for 5 minutes, dip them in cold water, then cut the kernels from the cobs. If using frozen corn, measure the specified package quantity. Prepare the peppers, celery and onion as measured.
- Combine peppers, celery, onion, sugar, vinegar, salt and celery seed in a saucepan. Bring to a boil and simmer for 5 minutes, stirring occasionally. Mix the dry mustard and turmeric with ½ cup of the simmered liquid, then add that mixture and the corn to the pan. Simmer for 5 more minutes.
- Pack the hot relish into hot half-pint or pint jars, leaving ½ inch headspace. Remove air bubbles, adjust headspace, wipe rims and fit prepared lids.
- Process hot half-pint or pint jars in a boiling-water canner: 15 minutes up to 1,000 ft (305 m), 20 minutes at 1,001–6,000 ft (306–1,829 m), or 25 minutes above 6,000 ft (1,829 m). These are the source’s US altitude adjustments; do not transfer them to different equipment without applicable guidance.
- Cool jars undisturbed, check seals, and refrigerate any unsealed jar. Store only correctly processed, sealed jars in a cool, dark place; refrigerate after opening.
Storage
Cool, dark storage only for correctly processed, sealed jars; refrigerate after opening or if unsealed · Follow the cited tested recipe; no additional shelf-life claim is made
Sources and scope
- Pickled Corn Relish — National Center for Home Food Preservation / USDA
Exact mixed corn relish recipe, including ingredient quantities and boiling-water process; this is not a plain corn pickle.