Sautéed Leeks make a nice side dish. They can also be used as a topping for a pizza or filling for a quiche or frittata.
Alternative way to clean leeks: Place leek on a cutting board. Starting halfway up the stalk (or about half an inch to an inch below the lowest opening) cut the leek into half lengthwise. Fan open the leek and place under cold running water to rinse out all the dirt. Make sure you get between all the layers. Clean off any dirt from your cutting board before you cut the leek into half rounds.