1. Begin by cutting off the tough dark green tops of the leeks, leaving the more tender white and paler green sections. Don’t cut off the root end, which will help the leeks stay together while cooking.

Slice each leek in half and rinse thoroughly to remove any dirt.

2. Bring a large pot of water to a boil over high heat and drop the leeks in, letting them cook until they begin to soften, about 5 minutes. Remove from the pot and place in a bowl of ice water to stop them from continuing to cook and also hold the color.

3. In a wide frying pan, heat the olive oil over medium-high heat. Place the leeks cut-side down in the pan and cook for several minutes until they are starting to brown. Transfer to a serving plate, sprinkle with Parmesan cheese, and season with salt and pepper to taste.