Add all the ingredients into a large nonreactive stockpot. Bring to a boil, reduce heat and simmer for 25 minutes.
While the relish is cooking, prepare your boiling water canner, 6-7 pint jars, and lids. See this video for more details. (See notes for canning alternative.)
Using one warm pint jar at a time, pack the relish into the jar, leaving 1/2 inch headspace. Run a non-metallic spatula inside the jar to release air bubbles. Attach lid to be finger-tip tight (not too tight) and place in rack of canner over simmering water. Repeat with remaining jars (if you are left with some that won't fill a jar, keep it in the refrigerator to eat right away).
Lower rack into water in canner, bring to a boil and start timing 15 minutes to process the jars, adjusting for elevation. Lower heat a bit to keep the water so it's not boiling too hard (check throughout the process to make sure it's evenly boiling).
When the timer goes off, remove the canner lid, turn the heat off and let the jars sit in the water for 5 minutes. Then remove the jars one at a time to a towel lined surface where they won't be disturbed for 12-24 hours.
After cooled, remove the rings and check all the seals by gently trying to remove lids. Fully sealed lids should not move. Any that aren't sealed can be refrigerated.
Label and date the lids and store the jars in a cool, dark place for up to 18 months.
Notes
*With the sweet corn we found even this reduced amount of sugar more sweet than we'd like so I omit it now. If you want to add the sweet, but can't use honey, use cane sugar instead.Canning Alternative: you can keep the jars in the refrigerator where they will store wonderfully for up to three months.-High Altitude Adjustment: If processing at an altitude of higher than 1000 feet above sea level you'll need to adjust the processing time according to this chart.-If you have any jars that didn't seal (which is rare!), store them in the fridge and use first.