A certain Monsieur Parmentier helped popularize the potato in France, and there was no trick that he wouldn’t use to do so. He had potato themed dinners with famous guests, like Ben Franklin and Thomas Jefferson. His best trick was to convince people that his potatoes were so valuable that they needed to be guarded by French troops. Then all the troops would leave at night, and he let peasants steal the potatoes. This famous soup is named in honor of the particularly clever Frenchman, and this is my version.
Ingredients
Butter
2 medium Leeks, trimmed
1 Shallot or Onion
1 clove Garlic
2 medium Potatoes, diced
2 cups Chicken Stock
Salt and Pepper
Cream (optional)

Split, carefully wash, and chop the leeks, including the green parts. Saute the chopped leek, onion, and garlic in butter until soft. Add the potatoes and chicken stock and simmer for forty five minutes to an hour, tasting occasionally for seasoning. Add water if needed. Cream is traditional but optional.

Now for some nomenclature. Potage is just the French word for soup: this soup served unprocessed and usually without cream is called Potage Parisien. Run through a food mill, blended, or just hit with a potato masher, it becomes Potage Parmentier (I personally am a potato masher guy). Processed with cream, and served chilled, it gets the fancy sounding name of Vichyssoise. French names allow restaurants to charge ten bucks for what is essentially a bowl of Potato Soup.