Pierce eggplants in one or two places with a toothpick. Either grill for 20 to 30 minutes until blackened and collapsed or cut in half lengthwise, place cut side down on foil lined baking sheets and broil until blackened and tender for 20 to 30 minutes. Transfer to a colander in the sink. Peel while hot and drain until cool. Squeeze gently to remove any bitter juices.