Potato Leek Soup (Silky, 5 Simple Steps)

What Makes This Recipe Work

Sweating the leeks gently in butter coaxes out their sweetness without browning, which would discolor the finished soup. The potato starch purees into the broth, giving the soup a naturally velvety body that reheats well.

Ingredients for Potato Leek Soup (Silky, 5 Simple Steps)

• 3 lb (1.4 kg) leeks (about 4 large), white and light green parts only
• 3 tbsp (42 g) unsalted butter
• 1 1/2 lb (680 g) Yukon Gold potatoes, peeled and diced into 3/4-inch cubes
• 4 cups (950 ml) vegetable broth
• 2 cups (480 ml) water
• 1 tsp salt, plus more to taste
• 1/2 tsp white or black pepper
• 1/2 cup (120 ml) heavy cream or half-and-half, optional
• 1 tbsp fresh lemon juice
• Chopped chives, for serving

How to Make Potato Leek Soup (Silky, 5 Simple Steps)

1. Clean the leeks: trim the roots and dark tops, slice the white and light green parts in half lengthwise, then crosswise into 1/4-inch half-moons. Submerge in a bowl of cold water, swish to release grit, and lift out into a colander; repeat if the water is still sandy.
2. Melt the butter in a large pot over medium-low heat. Add the cleaned leeks and 1/2 teaspoon of the salt, then cook gently until soft and silky but not browned, 8 to 10 minutes.
3. Add the potatoes, broth, and water, raise the heat, and bring to a boil. Reduce to a simmer and cook until the potatoes are completely tender, 15 to 18 minutes.
4. Blend with an immersion blender until completely smooth, about 2 minutes, or carefully transfer in batches to a countertop blender and blend on high with the lid vented.
5. Stir in the cream if using, the lemon juice, and the remaining salt and pepper, then warm gently until the soup is hot and lightly bubbling.
6. Taste and adjust the seasoning, then ladle into bowls and finish with chives and an extra grind of pepper.

Tips for the Best Potato Leek Soup (Silky, 5 Simple Steps)

• Leeks hide grit between their layers, so the cold-water rinse is not optional; swirl and lift rather than dumping the bowl.
• Keep the heat low while sweating. Browned leeks turn the soup dull beige instead of pale green-gold.
• The lemon juice is small but it lifts the whole pot; add it at the end so the flavor stays bright.
• No immersion blender? A countertop blender works; vent the lid and cover the opening with a folded towel to avoid hot splashes.

Variations and Substitutions

• For a smoother, more elegant bowl, swap half the potatoes for cauliflower and blend until glassy.
• The classic Potato Soup keeps the chunky direction if you prefer bites of potato to a puree.
• Loaded Baked Potato Soup is the bacon-and-cheddar answer when you want the same base in comfort-food form.
• A crisp bacon crumble on top adds smokiness without changing the vegetarian base below.

How to Store and Reheat

• Refrigerate for up to 5 days; the soup thickens as the potato starch sets, so loosen with broth when reheating.
• Freeze without the cream for up to 3 months, then thaw overnight and stir in cream or milk while rewarming.

Potato Leek Soup (Silky, 5 Simple Steps) FAQ