Cut the zucchini into small chunks and then process in batches in a food processor with the metal blade until it is finely chopped
Remove to a large bowl
Sprinkle with the salt and turmeric and mix well.
Cover with water.
Cover the bowl and let sit in a cool place for at least two hours.
Finely chop the garlic
Prepare the canner and heat the jars and keep warm until ready to use
Drain in a colander and then squeeze the zucchini to remove as much moisture as you can.
Remove to a large stock pot.
Add the onion, garlic, sugar, dill and vinegar.
Bring to a boil over medium high heat, reduce to a simmer and let cook for about 10 minutes until reduced and slightly thickened.
Heat the lids and have the bands handy.
Add the hot relish to the hot jars leaving 1/2″ headspace.
Use a non reactive spatula to remove bubble and adjust the relish in the jars. Add or remove relish if needed to maintain the proper headspace.
Wipe the rims with damp rag. Place the lid on and add the band and twist fingertip tight.
Add the jars to the canner and process for 15 minutes (20 minutes for over 3000 ft)
Remove from heat and let the jars sit for 5 minutes. Remove from the canner and let sit for 24 hours before checking the seals, removing the bands and storing.