Photo: Julia Kicova / Unsplash. Serving suggestion; presentation may vary.
Potato and leek soup has a mild, savoury flavour and a smooth texture without needing much cream. The important work happens before the stock goes in: gently soften the leeks so their sweetness develops without browning.
Creamy Potato and Leek Soup
Ingredients
- 400 g trimmed leeks, white and pale green parts
- 600 g floury potatoes, peeled and cut into 2 cm cubes
- 25 g unsalted butter
- 900 ml low-salt vegetable stock
- 100 ml double / heavy cream
- 1/4 teaspoon fine salt, plus more to taste
- 1/4 teaspoon ground black pepper
- 1 tablespoon chopped chives, optional
Preparation
- Split leeks lengthways, rinse between the layers and slice thinly. Swish slices in a bowl of cold water and lift out, leaving grit behind.
- Melt butter in a large saucepan over medium-low heat. Add leeks and salt. Cook for 8–10 minutes, stirring, until soft but not browned.
- Add potatoes and stock. Bring to a gentle boil, then partly cover and simmer for 18–20 minutes, until the potatoes crush easily with a fork.
- Take off the heat. Blend briefly with a stick blender until just smooth. Avoid prolonged blending, which can make potato soup gluey.
- Stir in cream and pepper. Warm gently until hot without a hard boil. Taste and adjust salt. Divide among bowls and finish with optional chives.
Practical tips
Leeks often trap soil close to the root, so cleaning whole outer surfaces is not enough. Floury potatoes give a softer finish than waxy salad potatoes. If you prefer texture, mash with a potato masher instead of blending. Never seal hot soup in an ordinary countertop blender; follow the appliance instructions and blend small vented batches only if the machine is rated for hot liquids.
Storage and make-ahead
Cool promptly in shallow containers and refrigerate within 2 hours. Use within 3 days and reheat only the portion needed until steaming hot. Freeze for up to 2 months; the texture may separate slightly, so stir well after thawing overnight in the fridge.
How to clean leeks properly
Leeks can trap soil between their layers. Trim the roots and toughest dark green ends, split the usable section lengthwise, and rinse between the layers under cool running water. Slice only after washing. The pale green portion is flavourful; clean, tougher tops can be saved for homemade stock.
Choosing potatoes for soup
Floury potatoes break down readily and produce a velvety texture, while waxy potatoes hold their shape. Cut the potatoes into similarly sized pieces so they cook evenly. Simmer gently until a fork slides through without resistance. A vigorous boil can evaporate too much liquid and cook the pieces unevenly.
Blending without making soup gluey
Overworking potatoes can make their starch sticky. Blend only until the texture is smooth enough for your taste. An immersion blender gives more control. If using a jug blender, let the soup cool slightly, work in small batches, and follow the appliance instructions for hot liquids. Steam pressure in a sealed blender can cause dangerous splashes.
Adjusting the consistency
If the soup is too thick, add warm stock or water gradually. If it is too thin, simmer uncovered briefly while stirring. Taste before salting, because packaged stock may already contain plenty. Finish with chopped chives, black pepper or olive oil, and refrigerate leftovers promptly in shallow containers.
Building flavour before adding stock
Cooking the leeks gently in butter or oil softens their sharpness and brings out their natural sweetness. Keep the heat moderate and stir so they do not brown heavily; dark browned leeks can change the colour and delicate taste of this soup. Add the potatoes after the leeks soften, then pour in enough stock to cook the vegetables as described in the recipe. A good stock should support the leek flavour rather than overwhelm it. Taste near the end because the salt level varies considerably between homemade and packaged stock.
How to make the soup lighter or richer
For a lighter bowl, use less cream and adjust the thickness with warm stock, adding a little at a time. For a richer texture, stir in the dairy near the end and warm gently without vigorous boiling. The potatoes themselves supply body, so you may find that only a small amount of cream is needed. If adapting the soup to be dairy-free, use oil instead of butter and an unsweetened dairy-free alternative, and check that your stock meets the dietary requirement. These substitutions change the flavour, so season again before serving.
Serving ideas for different seasons
Serve the soup warm with toasted bread, chopped chives or freshly ground pepper. A few crisp croutons add texture to the smooth base. For a casual lunch, pair it with a simple green salad and lemon dressing. In colder weather, a generous bowl makes a comforting starter or light meal. For a more elegant presentation, warm the serving bowls first and add herbs at the last moment. Avoid adding delicate garnishes long before serving because they wilt in hot soup.
Questions and common fixes
Why is my soup stringy? The leeks may not have been cooked until tender, or the fibrous dark tops may have been included. Why is it bland? Taste for salt, acidity and stock quality before adding more cream. Can it be made ahead? Yes; cool promptly and refrigerate, then reheat gently until steaming hot. Can it be frozen? It can, but dairy may separate and potatoes can change texture. Stir well after thawing and reheating.
Serving and allergens
Serve with homemade Moroccan bread. Contains milk; check the stock label for celery, wheat or other allergens. Use vegetarian stock for a meat-free soup.
More from our kitchen: homemade moroccan bread khobz.