Slice leeks in half length wise. Place in a shallow pan filled with water to clean. Gently open the layers of the leek to remove any sand, then rinse under cool water. Lay on paper towels to dry.

Heat oven to 425 degrees. Prepare a baking sheet with parchment paper.

Place leeks on roasting pan and drizzle with olive oil. Sprinkle with salt and pepper. Place in oven to roast for approximately 15 minutes or until edges turn golden brown.

Remove from oven and sprinkle on fresh lemon juice.