In a shallow dish soak leeks in cold water to cover 15 minutes, rubbing occasionally to remove any grit. In a heavy skillet melt butter over moderate heat. lift leeks out of the water and with water still clinging to them add to skillet. Cook leeks, stirring occasionally, five minutes and add broth and zest. Braise leeks, covered, 5 minutes, or until very tender, and season with salt and pepper.
Nancy and Tim Bass - Sunburst Tomato