Instructions
Prepare hot jars and lids. If using fresh corn, boil the ears for 5 minutes, cool, and cut the kernels from the cob. Measure 10 cups.
Combine peppers, celery, onions, sugar, vinegar, salt, and celery seed in a large pot. Bring to a boil and simmer 5 minutes, stirring occasionally.
Mix the dry mustard and turmeric with 1/2 cup of the hot mixture. Return it to the pot with the corn and simmer 5 minutes.
Pack hot relish into hot half-pint or pint jars, leaving 1/2-inch headspace. Remove bubbles, adjust headspace, wipe rims, and apply lids.
Process half-pints or pints for 15 minutes at 0–1,000 ft, 20 minutes at 1,001–6,000 ft, or 25 minutes above 6,000 ft. Cool 12 to 24 hours and check seals.