Equipment
Ingredients
Aromatics and Base
- 45 g unsalted butter
- 450 g leeks, sliced
- 450 g russet potatoes, peeled and thinly sliced
Liquids and Seasoning
- 900 ml chicken broth
- 120 ml heavy cream, chilled
- 10 g kosher salt
- 2 g white pepper, finely ground
Garnish
- 10 g fresh chives, finely minced
Nutrition (per serving)
Method
Melt the butter in a heavy pot or Dutch oven over medium-low heat. Add the sliced leeks and cook gently, stirring occasionally.
Add the sliced russet potatoes and the chicken broth to the pot. Increase the heat to bring the mixture to a gentle boil.
Reduce the heat to low, cover the pot, and let the soup simmer until the potatoes are completely cooked through and falling apart.
Remove the pot from the heat and allow it to cool slightly. Working in batches, transfer the mixture to a blender and process until completely smooth.
Pour the pureed soup through a fine mesh sieve into a clean, large mixing bowl, using a ladle or spatula to push it through. Discard any fibrous solids left behind.
Whisk the heavy cream, kosher salt, and white pepper into the smooth, strained soup base.
Cover the bowl securely and place it in the refrigerator. Chill until thoroughly cold, ideally reaching 4°C/40°F, which requires at least 4 hours.
Taste the soup once fully chilled and adjust the salt if necessary. Ladle into chilled bowls and sprinkle generously with minced fresh chives just before serving.
Chef's Notes
- White pepper is entirely necessary here. It maintains the pristine ivory color of the soup while providing a distinct, earthy warmth that black pepper cannot replicate.
- For the smoothest, most luxurious texture, never skip the fine mesh sieve. It catches the fibrous strands of the leeks that survive the blending process.
- Because cold temperatures mute our ability to taste salt, always perform a final seasoning check right before serving. A hot soup perfectly seasoned will taste bland once chilled.
- Chilling the serving bowls in the refrigerator for 30 minutes prior to eating ensures the soup stays refreshing to the very last spoonful.
Storage
Refrigerator: 4 days — Flavors continue to meld and improve after the first 24 hours of chilling.
Freezer: 2 months — Freeze the soup base before adding heavy cream. Adding cream before freezing can cause separation when thawed.
