1/2cupparmesan broth (from NY Times), (This is a bit of a process, so you can also use white wine, which is what the original recipes calls for)
1ouncefreshly grated parmesan
Instructions
Cut off the ends (both dark green ends and white bulb) of the leeks and split in half lengthwise. You can remove the grit off of the leeks by placing leeks in a bowl of cold water for 5 minutes to remove grit. Remove from cold water and rinse to remove any other excess grit.
Heat a medium broil-proof skillet over low-medium heat and add oil. Place leeks down, cutside up and saute until brown, about 2-3 minutes. Flip leeks over and brown other side for 2-3 minutes.
Add in parmesan broth and bring heat up to a medium. Once the mixture is bubbling somewhat vigorously, lower heat to a simmer. Simmer until the majority of the liquid has been reduced/evaporated and leeks are tender, about 15 minutes. During this time, preheat broiler.
Top with parmesan and place in broiler until cheese is fully melted and lightly browned, about 2 minutes.