Peel and finely slice the onions into thin rings. Add them to a large bowl filled with ice cubes and a little water. Let them soak in the ice water for 15 minutes, then drain the water and pat dry the lachha onions.
Add the rest of the ingredients into the bowl along with the onions.
Use your hands or two spoons to mix everything well, ensuring that all the onion rings are nicely coated in the spices.
Allow the salad to rest for a few minutes and then serve.
Notes
Use Kashmiri red chili powder to season the sliced onion rings. It has that brilliant red color you’re looking for, but isn’t overly spicy. This isn’t one of those salads that can be prepped ahead of time. Raw onion loses its crunch once it is tossed with the spices and salt, so it makes sense to put this salad together right when you want to serve it. If you’re using any other kind of onions for the recipe, you won’t need to soak them in the ice water for as long, since they’re not as pungent as red onions