Wash cucumbers and trim a thin slice off the blossom end. Slice cucumbers and onions into rounds ¼ inch thick.
Combine in a large bowl or pot sprinkle salt over top. Cover and place in the fridge for 2 to 3 hours.
Drain cucumber mixture and rinse.
In a large stock pot combine remaining ingredients and bring to a boil. Boil for 10 minutes then add cucumber mixture. Return to a boil and remove from heat.
Ladle into jars.
Run a spatula around the outside edges of the jar to remove air bubbles.
Wipe the jar rims with a damp cloth.
Add lids and water bath can for 10 minutes or according to your altitude.