Melt the butter over medium heat in a large heavy bottomed pot or dutch oven. Sautee the leeks for 5-7 minutes until wilted and tender. Meanwhile, peel and cube the potatoes and mince the fresh thyme leaves.
Season the leeks with a pinch of kosher salt before adding the the thyme and bay leaves to the pot. Cook for one minute more until fragrant and then add the stock and water to the pot. Bring it to a gentle, simmering boil and let it go for anywhere from 20-30 minutes until the potatoes are absolutely fork tender. Remove the bay leaves and puree using an immersion blender if you have one. (Transfer to the blender if you don't.) David Lebowitz warns that using a food processor could cause the potatoes to take on a gummy texture so avoid that method in this case.
The soup will likely need more salt if you use a low sodium stock so taste and season until you get it just right. Some use white pepper to avoid black flecks in the soup but that doesn't bother me. I cracked some black pepper in there as well.
I served the soup piping hot with a dollop of sour cream and a few snips of green onions. (I also made a rather elementary style "ham and cheese toast" with some dijon mustard, black forest ham and gruyere cheese to eat alongside the soup. I topped some fresh, lightly toasted, ciabatta bread with a drizzle of dijon, a slice of ham and some thin slices of gruyere. I then toasted it under the broiler for a minute before serving.


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