Directions:
- Sauté Leeks:
- Heat butter in a large saucepan or Dutch oven over medium heat until melted.
- Add leeks, reduce heat to low, and cook, stirring frequently, until very soft but not browned (10-15 minutes).
- Cook Soup:
- Add stock, potatoes, and bay leaf. Season lightly with salt and pepper.
- Bring to a boil over high heat, reduce to a gentle simmer, cover, and cook until potatoes are tender (about 15 minutes).
- Blend and Finish:
- Remove potatoes with tongs and set aside. Discard bay leaf.
- Blend remaining soup until smooth. Return to a clean pot.
- Press potatoes through a ricer or food mill into the pot.
- Whisk in buttermilk, heavy cream, and nutmeg.
- Simmer over medium-high heat, whisking frequently. Season to taste with salt and pepper.
- Serve:
- Garnish with chives or scallions.
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