Steamed Leeks in White Sauce

I think that any vegetable in a creamy well-made white sauce makes a good accompaniment to roast meat, but leeks in white sauce are especially good with Roast Leg of Lamb and with Roast Rack of Lamb with a Herb Crust. They are also delicious with Steak, Kidney and Mushroom Pie, and with Game Pudding, too. It is so much better to steam the leeks rather than to simmer them in water, because, like onions, leeks hold so much water that when they are cooked in it, it is pretty well impossible to