This is an incredibly easy and very wonderful way to prepare leeks. It is a perfect accompaniment for grilled fish or chicken served with buttered noodles. From the Perfect Vegetables Cookbook by Cook's Illustrated.
If you love onions, you will love this, I can make a meal just on these onions alone lol! Make sure that you purchase small sweet baby onions for this. Plan ahead the onions need to marinade for about 1 hour. You can double the recipe if desired.