Preheat The Oven To 325 Degrees. With Tongs Or A Slotted Spatula, Arrange The Leeks In One Layer In A Shallow, Buttered Baking Dish. Taste The Stock For Seasoning, Then Pour It Over The Leeks And Bake Them Covered Loosely With A Sheet Of Aluminum Foil. In 20 Minutes Or So The Leeks Should Be Lightly Colored And The Stock Almost Cooked Away. If The Stock Has Not Reduced Enough, Transfer It To A Small Saucepan With A Bulb Baster Or Spoon And Boil It Down. Serve The Leeks Directly From The Baking Dish Or Arrange Them On A Heated Platter And Pour The Syrupy Stock Over Them.