Preserve · field guide
Sweet Corn Relish
When the corn all comes ripe in one week, relish is how you keep that sweet crunch on the shelf. This is a vinegar-based relish, so the acid does the safety work and a water-bath canner does the rest. It is bright, a little tangy, and great on hot dogs, beans, or a bowl of chili in January.
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Why this one works
Corn on its own is a low-acid food, which is not safe for a water-bath canner. This recipe fixes that by soaking everything in 5% vinegar. The vinegar is not just for flavor. It brings the whole jar down to a safe acid level so a boiling-water bath is enough.
You still get the sweet corn taste. The sugar and peppers balance the vinegar so it lands tangy, not sour.
Pick and prep the corn
Use corn picked the same day if you can. Sugar in sweet corn turns to starch fast once it is off the stalk, so a same-day ear tastes noticeably sweeter than one that sat 3 days.
Boil the ears for 5 minutes, cool them, then cut the kernels off. That pre-boil is part of the tested process, not just a convenience, so do not cut the kernels off raw. You need about 8 to 10 ears to fill 4 cups. Dice the peppers and onion small so every forkful has a mix.
Keep it safe
Do not cut the vinegar or swap in a milder one. Use vinegar labeled 5% acidity, measured, every batch. That number is what keeps this shelf-stable.
Leave 1/2 inch of headspace at the top of each jar. Wipe the rims, set the lids, and process pint or half-pint jars for 15 minutes in a boiling-water canner at 0 to 1,000 feet, 20 minutes from 1,001 to 6,000 feet, and 25 minutes above that. When the jars cool, check that every lid sealed and pressed down flat. Refrigerate any jar that did not seal and eat it within a week.
One honest note: this takes an afternoon. Between shucking, the corn pre-boil, dicing, simmering, and the 15-minute process, plan on 2 hours for a batch. This recipe follows the NCHFP tested process for pickled corn relish; if you want to scale it or change the jar size, work from their published version rather than adjusting these numbers yourself.
How long it keeps
Sealed jars keep their best quality for about 12 months in a cool, dark pantry. Label each jar with the date so you eat the oldest first. Once you open a jar, keep it in the fridge and use it within 2 weeks.
Recipe
Ingredients
- 4 cups fresh sweet corn kernels (about 8 to 10 ears)
- 1 cup diced red bell pepper
- 1 cup diced green bell pepper
- 1 cup diced onion
- 1 cup diced celery
- 2 1/4 cups vinegar (5% acidity)
- 1 cup sugar
- 1 tbsp canning or pickling salt
- 2 tsp mustard seed
- 1 tsp celery seed
- 1 tsp ground turmeric
Method
- Wash jars and keep them hot. Heat water in the canner.
- Boil the shucked ears 5 minutes, cool them in water, then cut the kernels from the cobs. Dice the peppers, onion, and celery small.
- In a large pot, combine the vinegar, sugar, salt, mustard seed, celery seed, and turmeric. Bring to a boil.
- Add the corn and vegetables. Simmer 10 minutes, stirring so it does not scorch.
- Pack the hot relish into jars, leaving 1/2 inch headspace. Slide a clean tool down the side to release air bubbles.
- Wipe the rims, set lids and bands finger-tight, and lower the jars into the canner.
- Process pints or half-pints 15 minutes at a full rolling boil (0 to 1,000 ft; add 5 minutes to 6,000 ft, 10 minutes above).
- Cool the jars 12 to 24 hours, then check every seal. Refrigerate any that did not seal.
Keep going
Questions, answered straight
No. The 5% vinegar is what makes this safe in a water-bath canner. Cutting it drops the acid below a safe level. If you want it sweeter, add a little more sugar instead, but keep the vinegar as written.
Yes. The tested process boils the ears 5 minutes before the kernels come off, and the 15-minute process time assumes that step was done. It also makes the kernels easier to cut off cleanly. Do not start from raw kernels.
About 12 months at best quality in a cool, dark pantry. It stays safe longer if sealed, but the flavor and crunch fade. Refrigerate after opening and use within 2 weeks.
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