In a saucepan, melt butter and add leeks along with a pinch of kosher salt and let them “sweat” for five minutes over medium heat. Decrease heat to medium/low and cook another 25 minutes until leeks are tender. Add potatoes and broth and increase heat to a boil. Once it is boiling, cover and turn back to low, keeping on a simmer for about 45 minutes. Remove from heat and puree in a blender, food processor, or using an immersion blender. Add cream, buttermilk, and pepper and stir until combined.

Serve hot or cold!

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