Peel the cucumbers, leaving intermittent strips of green peel on the cucumber for added color and cut into 3 inch chunks.
6 large cucumbers - partially peeled - leave some green on for color
Peel the onions and cut into 3 inch chunks.
4 cups yellow or white onions chopped finely or shredded
Shred the cucumber and onion in a food processor to a coarse consistency. Pulse 4 times until every chunk is just shredded, and no more.
Chop the red pepper or slice into fine shreds on a mandolin.
1 large red pepper, chopped finely
Place vegetables in a nonreactive bowl - glass or stainless steel.
Pour ¼ cup canning salt or Kosher Salt over the onion/cucumber/red pepper mixture. Mix well and cover with a clean tea towel.
¼ cup canning salt or Kosher Salt
Leave overnight or for 4 hours until vegetables release their juices, and the mixture looks wet and soupy.
Drain the shredded vegetables into a colander or sieve then wring the juices out by spooning them into a cotton towel or double cheese cloth over the sink or bowl. Pick up the corners of the tea towel and wind them together over your hand, twisting and squeezing. As the towel twists, juices and brine are squeezed out of the vegetable mixture. Work it until the vegetables are just moist but not dripping with juice.