How to remove the bitterness of onion

2 onion, 1 tbsp vinegar, 1/2 tsp salt, 2 cup chilled water. Peel the onion, chop or slice it.

Take a bowl add chilled water, vinegar, salt and mix well. Onion put it into the bowl leave for 10 minutes stirring once or twice, before draining and using them in your salad.