I'm going to do some classics for a bit that you may conceivably eat so you can be psyched for Mad Men's premiere. All Classic Retro Recipe Monday Recipes come from The Food Network unless otherwise stated.
In large pot melt butter. Add leeks and cook over medium heat, stirring occasionally. Add potatoes and season with salt and pepper. Add water and bring to a simmer. Cook until vegetables are tender. Place 3/4 of soup into a blender and puree, return to pot and stir in cream. Serve hot or cold