Love this? Pin it for later!
I first tasted this soup fifteen years ago in a tiny café tucked between bookshops on the Left Bank of Paris. The bowl arrived unadorned, save for a thin ribbon of emerald-green oil shimmering across the surface. One sip and I was transported: silk-smooth, deeply savory, yet somehow bright. I begged the chef for hints, but he only smiled and said, “Respect the leek, and it will respect you.” I spent the next decade refining my own version, trading the heavy cream of traditional recipes for a lighter potato purée, whisking in a splash of buttermilk for tang, and finishing with a homemade chive oil that tastes like spring even in the dead of winter.
Today this is the soup I make when friends drop by unexpectedly, when someone needs comfort, or when I simply want my kitchen to smell like a hug. It comes together in under an hour, freezes beautifully, and—thanks to the chive oil—feels restaurant-worthy without any last-minute fuss. Serve it with crusty sourdough, a crisp green salad, and a glass of chilled Chablis, and you’ll understand why my neighbor calls it “the cure for everything from heartbreak to head colds.”
Why This Recipe Works
- Double-layered leek flavor: Sweet sautéed whites build the base, while tender green ribbons finish as garnish.
- Fluffy Yukon Golds: Their naturally creamy texture eliminates the need for heavy cream.
- Chive oil in 30 seconds: A high-speed blender turns fresh chives and neutral oil into a vibrant, stable emulsion.
- Make-ahead friendly: Flavors deepen overnight; soup reheats without separating.
- Vegetarian, easily vegan: Swap olive oil for butter and oat milk for buttermilk.
- Freezer hero: Portion into silicone muffin cups, freeze, then pop out into zip bags for single-serving comfort.
Ingredients You'll Need
Great potato and leek soup starts with great produce—there’s nowhere for bland ingredients to hide. Look for leeks with crisp, tightly wrapped leaves and no slimy spots; smaller leeks (under 1¼ in / 3 cm diameter) are sweeter and more tender. Yukon Gold potatoes are my gold standard for their naturally creamy, almost buttery flesh. Avoid high-starch russets here; they’ll absorb liquid and turn gluey. If you can only find russets, cut the simmering liquid by 10 % and watch the pot like a hawk.
Unsalted European-style butter (82 % fat) gives a silkier mouthfeel than standard American butter. If you keep kosher salt or fine sea salt on hand, use half the volume called for table salt. For the chive oil, choose a neutral oil such as grapeseed or sunflower; olive oil’s grassy notes muddy the chive flavor. A micro-plane of organic lemon zest brightens the oil without turning it brown.
How to Make Creamy Potato and Leek Soup with Chive Oil
Prep the leeks
Trim root ends and tough dark-green tops, leaving 2 in / 5 cm of pale green. Slice in half lengthwise, then crosswise into ¼-in / 6 mm half-moons. Submerge in a large bowl of cold water, swishing to release grit. Let stand 2 min so sand falls to bottom. Lift leeks into a colander; repeat if needed. Spin dry in a salad spinner—excess water will spatter in hot fat.
Build the aromatic base
Melt 3 Tbsp butter in a heavy 4-qt Dutch oven over medium-low. Add leeks, bay leaf, and ½ tsp salt. Cook 8–10 min, stirring occasionally, until leeks are translucent and velvety but not browned. If edges start to color, reduce heat and add a splash of water.
Add potatoes & liquid
Stir in diced potatoes, 3½ cups vegetable stock, and 1 cup water. Increase heat to high; bring just to a boil. Immediately reduce to a gentle simmer, partially cover, and cook 15 min or until potatoes shatter when pressed with a fork.
Purée until silk-smooth
Fish out bay leaf. Using an immersion blender, blend directly in pot 45 seconds, moving head in slow circles. For extra velvety texture, pass through a fine-mesh sieve back into pot. If using a countertop blender, vent lid and blend in small batches.
Finish with brightness
Return soup to gentle simmer. Whisk in buttermilk and white pepper; warm 2 min—do not boil or buttermilk may curdle. Taste and adjust salt; soup should sing with sweet leek and subtle tang.
Blend the chive oil
Combine ½ cup neutral oil, ½ cup packed fresh chives, and ¼ tsp kosher salt in a high-speed blender. Start on low, then increase to high for 20 seconds. Strain through coffee filter for crystal-clear green oil or use as-is for rustic flecks.
Serve & garnish
Ladle soup into warm bowls. Drizzle 1 tsp chive oil in a lazy spiral. Scatter a few thin raw leek rings for crunch, add a crack of white pepper, and serve immediately with buttered sourdough.
Expert Tips
Temperature discipline
Keep heat low when sweating leeks; browned edges turn bitter. If they do color, deglaze with a splash of water and proceed—no harm done.
Chill your blender
For the brightest green chive oil, chill oil and chives 15 min before blending; heat dulls chlorophyll.
Volumetric portioning
Freeze soup in 1-cup silicone muffin trays; pop out and store in zip bags for quick solo lunches.
Double-batch wisdom
Soup thickens as it sits; thin with stock or milk when reheating, not water, to preserve flavor.
Overnight upgrade
Make soup a day ahead; flavors meld and sweeten. Store chive oil separately to keep its vivid color.
Color pop
Add a teaspoon of raw spinach to the chive oil for an even greener hue without altering flavor.
Variations to Try
-
Spring edition: Swap half the potatoes for asparagus tips; add a handful of fresh peas during the last 2 min of simmering. Finish with lemon zest instead of chive oil.
-
Smoky twist: Stir in ½ tsp smoked paprika with the leeks and finish with crumbled roasted tempeh “bacon.”
-
Extra protein: Add one rinsed can of cannellini beans during puréeing for a creamy white-bean potato soup that keeps you full for hours.
-
Asian-inspired: Replace butter with toasted sesame oil, swap stock for kombu dashi, and finish with miso-chive oil (blend 1 tsp white miso into the oil).
-
Luxe dinner party: Fold in 4 oz cold-smoked salmon ribbons just before serving and replace buttermilk with ½ cup crème fraîche.
-
Zero-waste: Save leek tops for homemade vegetable stock; freeze in ice-cube trays for future soups and risottos.
Storage Tips
Cool soup completely within 2 hours of cooking (transfer to shallow pans to speed chilling). Refrigerate in airtight containers up to 4 days. For longer storage, ladle cooled soup into freezer-safe pint bags, lay flat to freeze—saves space and thaws quickly. Use within 3 months for best flavor, though safe indefinitely at 0 °F / -18 °C. Thaw overnight in fridge or 10 min under cool running water. Reheat gently over medium-low, thinning with vegetable stock or milk until pourable. Avoid boiling after dairy has been added to prevent curdling.
Chive oil keeps 1 week refrigerated in a squeeze bottle; bring to room temp before drizzling (cold oil clouds). For longer storage, freeze oil in ice-cube trays; pop out a cube and let it liquefy at room temp for 5 min before using.
Frequently Asked Questions
Creamy Potato and Leek Soup with Chive Oil
Ingredients
Instructions
- Prep leeks: Halve lengthwise, slice ¼-in crosswise, rinse away grit, spin dry.
- Sauté aromatics: Melt butter in Dutch oven over medium-low. Add leeks, bay leaf, ½ tsp salt; cook 8–10 min until translucent.
- Simmer vegetables: Stir in potatoes, stock, water; bring to boil, reduce to simmer 15 min until potatoes are very tender.
- Purée: Remove bay leaf; blend until silky with immersion blender. Strain if ultra-smooth texture desired.
- Finish soup: Whisk in buttermilk and white pepper; warm 2 min. Adjust salt.
- Make chive oil: Blend oil, chives, pinch salt 20 sec until bright green.
- Serve: Ladle into bowls, drizzle chive oil, garnish with sliced leek greens.
Recipe Notes
Soup thickens on standing; thin with stock or milk when reheating. Chive oil keeps 1 week refrigerated; bring to room temp before serving for best color.
