Ingredients for - Vichyssoise

1. 3 tbsp. butter
2. 3 large leeks, white and light-green parts thinly sliced and rinsed well
3. 1 medium yellow onion, finely chopped
4. 1 1/4 tsp. kosher salt
5. 3/4 tsp. freshly ground black pepper
6. 1/4 tsp. ground white pepper
7. pinch of freshly grated nutmeg
8. 2 lb. white potatoes (about 5 medium), peeled and chopped
9. 4 c. low-sodium chicken broth or water
10. 2 c. half-and-half
11. 1 c. ice cubes
12. Sour cream or crème fraîche and sliced chives, for serving (optional)

How to cook deliciously - Vichyssoise

1 . Stage

In a large pot over medium-high heat, melt butter. Add leeks, onion, salt, black pepper, white pepper, and nutmeg. Cook, stirring occasionally, until softened and slightly golden, about 20 minutes. 

2 . Stage

Stir in potatoes and broth and bring to a boil. Reduce heat to medium-low, cover, and cook until potatoes are falling apart, about 30 minutes.

3 . Stage

Remove from heat and let cool 5 minutes. Using an immersion blender, blend soup until smooth. If desired, pass through a fine-mesh sieve to remove any remaining chunks. Stir in half-and-half and ice, then transfer to the refrigerator to chill until cold.

4 . Stage

Divide soup among bowls. Top with a dollop of sour cream and chives, if using.