Leeks, to clean:
Using a paring knife, slice leek from stem to stern from a quarter-inch under the root all the way to the tip then quarter turn and do it again cutting all the way through each time. Keep cutting and turning until you have ribbons of leek attached to the root.This exposes the dirt in which they were grown which could make your dish gritty if you don’t get it all out so rinse thoroughly in cold running water or in a bowl of water.