I love this simple salad which goes really well with most dishes. It's really easy to make. All you need to do is:
Slice onions thinly, then sprinkle them with salt and let them stand for a few minutes. Then rinse well to remove all the salt and drain. This helps reduce the extra oniony smell and softens the onions slightly
Mix the two together, season with lime juice and add some chopped chili and coriander if you like.