3largeleeks, thoroughly cleaned and finely chopped (use only the white parts)
2mediumpotatoes, peeled and cut into ½-inch dice
4cupsvegetable broth (preferably low-sodium)
1cupheavy cream
1tablespoonhigh-quality olive oil
1tablespoonunsalted butter
to tasteSalt and freshly ground white pepper
to tasteFresh chives, finely chopped (for garnish)
Instructions
In a large, heavy-bottomed pot, warm the olive oil and butter over medium heat. Once melted, add the chopped leeks. Sauté for about 5 minutes, stirring occasionally, until the leeks are soft and translucent without browning.
Add the diced potatoes to the pot and stir for an additional 2 minutes to coat them in the leeks and fat.
Carefully pour in the vegetable broth, increase the heat, and bring the mixture to a gentle boil. Once boiling, reduce the heat to a low simmer. Cover the pot and cook for about 20 minutes, or until the potatoes are fork-tender.
Remove the pot from the heat and let the soup cool for about 10 minutes. Using an immersion blender, blend the soup until it reaches a velvety smooth consistency. If you don’t have an immersion blender, transfer the mixture in batches to a countertop blender and blend until creamy, ensuring to allow steam to escape.
After blending, stir in the heavy cream. Season generously with salt and freshly ground white pepper to taste, adjusting according to your preference.
Allow the soup to cool to room temperature before refrigerating it. Chill the mixture in the refrigerator for at least 2 hours, or until it is thoroughly cold.
Right before serving, taste the vichyssoise one last time and adjust the seasoning if needed.
Notes
Serve in pre-chilled bowls with a drizzle of cream and chives for garnish.