Arrange brinjal slices on a plate and put it in the freezer. Take out after the given time. When the slices soften, press out a lot of water with the palm of your  hand, releasing most of the bitterness.

Slice the brinjal then sprinkle salt onto one side. Leave brinjal aside for 30 minutes to allow the solanine (a chemical found in the flesh) to drain out. Now gently wipe off with a damp cloth.

After slicing the brinjal, soak it in heavily salted water. Now rinse with cold water and wipe brinjal dry with a cotton cloth. This removes much of the bitter taste.