Lettuce Soup Recipe with Potatoes and Fresh Herbs

Lettuce soup is a gently flavored vegetable soup made by simmering tender lettuce with potatoes, onion, broth, and herbs, then blending it until smooth. Versions appear in different European home-cooking traditions, and this one is a practical way to turn a fresh head of lettuce into a warm, creamy bowl. Potato gives the soup body, while lemon and fresh dill keep the finished flavor bright rather than heavy.

Ingredients

2 tablespoons unsalted butter (28 g)
1 tablespoon olive oil (15 ml)
1 medium yellow onion, finely chopped (about 1 cup / 150 g)
2 garlic cloves, minced (about 6 g)
1 pound Yukon Gold potatoes, peeled if desired and cut into ½-inch cubes (450 g)
4 cups low-sodium vegetable broth or chicken broth (950 ml)
1 large head green leaf, butter, or romaine lettuce, washed, dried, and roughly chopped, tough core discarded (about 10–12 ounces / 280–340 g)
1 teaspoon fine salt (5 g), plus more to taste
¼ teaspoon freshly ground black pepper (about 0.5 g)
½ cup heavy cream (120 ml), or whole milk for a lighter soup
1 tablespoon fresh lemon juice (15 ml)
2 tablespoons chopped fresh dill (about 6 g)
Optional for serving: 2 tablespoons chopped chives (about 6 g) and ¼ cup croutons (about 15 g)

Instructions

Wash and prepare the vegetables. Rinse the lettuce leaves well, checking between the leaves for grit, then dry them thoroughly in a salad spinner or with a clean towel. Remove the thick core and chop the leaves into rough pieces. Chop the onion, mince the garlic, and cube the potatoes; doing this before you start cooking keeps the short simmering stages easy to manage. The stated prep time includes this washing and chopping.
Soften the onion and garlic. Set a large heavy pot or Dutch oven over medium heat. Add the butter and olive oil. When the butter has melted, add the onion and salt and cook for 6 minutes, stirring now and then, until the onion is soft and translucent but not browned. Stir in the garlic and black pepper and cook for about 30 seconds, just until fragrant. Keep the heat moderate: browned garlic can make the soup taste bitter.
Simmer the potatoes. Add the cubed potatoes and broth, then bring the liquid to a gentle boil. Lower the heat, partially cover the pot, and simmer for 16 minutes, stirring once or twice. The potatoes should be very tender when pierced with a fork. If they are still firm in the center, give them another minute or two before adding the lettuce; the greens need only a brief cook.
Wilt the lettuce. Stir in the chopped lettuce a few handfuls at a time. It will look bulky at first, but it collapses quickly into the hot broth. Simmer uncovered for 3 minutes, stirring once, until the leaves are fully wilted and bright green. Avoid a long boil, which can dull the color and flatten the fresh, mild flavor.
Blend and finish. Remove the pot from the heat and use an immersion blender to puree the soup until smooth, keeping the blade submerged to limit splashing. Alternatively, blend in batches in a countertop blender, filling it no more than halfway and venting the lid according to the blender’s instructions so steam can escape. Return the soup to low heat, stir in the cream, lemon juice, and dill, and warm gently for 2 minutes without letting it boil. Taste and adjust the salt, pepper, or lemon before serving.

Tips

Clean lettuce carefully. Soil can collect around the base and between tightly folded leaves. Separate the leaves before rinsing, and dry them well so you do not dilute the broth. If the lettuce is unusually large, weigh out roughly 300 g of trimmed leaves; a little more or less is fine because it wilts down substantially.
Keep the color fresh. Add lettuce only after the potatoes are tender, and simmer it for about 3 minutes. Cooking it for a long time can turn the soup a muted olive color. The flavor will still be pleasant, but the bright green appearance is best when the greens are cooked briefly.
Adjust the texture gradually. For a thicker soup, use the smaller end of the lettuce weight range or add a little less broth at first. For a thinner soup, stir in extra warm broth after blending, a few tablespoons at a time. Do not add lots of liquid before blending, because the soup is easier to thin than to thicken afterward.
Choose the dairy to suit your preference. Heavy cream makes the soup rounder and silkier, while whole milk keeps it lighter. For a dairy-free version, omit the butter and cream, use olive oil, and finish with unsweetened oat cream or a little additional broth. Add any non-dairy cream gradually and avoid boiling it, since some products can separate over high heat.

Serving Suggestions

Serve the soup hot in warmed bowls, with chopped chives, a small swirl of cream, or a few croutons scattered over each portion. Toasted sourdough, rye bread, or a plain crusty loaf is useful for dipping and makes the meal more substantial. A simple green salad with a sharp vinaigrette can provide a crisp contrast to the smooth soup, while a cheese toast or savory tart works well when you want a fuller lunch.

The soup has a mild, gently savory flavor, so keep toppings restrained enough that they do not overwhelm the lettuce. A few drops of lemon juice or a little extra black pepper at the table can bring out its freshness. If serving it as a first course, pour smaller portions and save the croutons for just before eating so they stay crisp.

Variations

Make it without cream: Leave out the cream and use vegetable broth for a dairy-free bowl, or blend in ½ cup (about 80 g) of cooked white beans for extra thickness. The beans make the texture denser and add a mild, earthy note; add a splash of broth if the puree becomes too thick.

Add peas or fresh herbs: Stir 1 cup (145 g) of frozen peas into the pot with the lettuce and cook until heated through, about 3 minutes. Peas bring sweetness and a stronger green color. You can also replace some or all of the dill with parsley, chives, or a small amount of tarragon. Tarragon has a more pronounced anise-like aroma, so start with 1 teaspoon chopped and add more only after tasting.

Use another lettuce: Butter lettuce gives a delicate, soft flavor; green leaf and romaine make a slightly more assertive soup. Avoid relying on iceberg alone, because it has a high water content and less flavor after cooking. If using a mix of lettuce and tender spinach, replace up to half the lettuce by weight with spinach and add it at the same stage.

Leave it rustic: Blend only part of the soup, or mash some of the potatoes against the side of the pot before adding the cream. This gives you a thicker, more textured bowl instead of a completely smooth puree. If you want a richer finish, add a tablespoon of butter off the heat, but taste before adding extra salt because butter and broth vary in saltiness.

Storage and Reheating

Let leftover soup stop steaming, then refrigerate it in a covered, shallow container within 2 hours of cooking. It keeps for 3–4 days in the refrigerator. The green color may become less vivid as it sits, but that is a change in appearance rather than a reason to discard soup that has been stored safely. For the best texture, store croutons and fresh herb toppings separately and add them only when serving.

Reheat a portion in a saucepan over medium-low heat, stirring often, until steaming hot throughout. Reheat leftovers to 165°F (74°C), checking with a food thermometer, and avoid a hard boil because prolonged boiling can affect the dairy texture and the color. A microwave also works: cover loosely, heat in short intervals, and stir between intervals so the soup warms evenly. If it has thickened in the refrigerator, loosen it with a splash of broth or water.

You can freeze the soup for up to 2 months in a freezer-safe container, leaving space for expansion. Cream-based soups can separate slightly after thawing, so for the smoothest result freeze the blended soup before adding cream, then stir in the cream while reheating. If it was frozen with cream, thaw it overnight in the refrigerator and blend briefly after reheating if the texture looks uneven. Do not leave soup at room temperature for extended storage.

Frequently Asked Questions

Does lettuce soup taste strongly of lettuce?

No. Lettuce has a mild flavor when cooked, and the onion, potato, broth, herbs, and lemon are all noticeable in the finished soup. Butter lettuce makes it especially delicate, while romaine gives a slightly more pronounced green flavor. If you want a stronger herbal note, add a little extra dill or chives at the end rather than increasing the cooking time.

Can I make lettuce soup ahead?

Yes. Make the soup through blending, cool and refrigerate it, then add the cream, lemon, and dill as you reheat it for serving. This approach helps preserve a fresher color and lets you adjust the seasoning at the end. If you have already added everything, it is still fine to refrigerate and reheat; warm it gently and stir well.

Can I use lettuce that is slightly wilted?

Leaves that are limp but still clean and fresh-smelling are suitable for soup, since they will be cooked and blended. Remove slimy, discolored, or unpleasant-smelling leaves, and do not use lettuce that shows signs of spoilage. Wash the remaining leaves carefully and dry them before adding them to the pot.

Do I need to peel the potatoes?

No. Yukon Gold potatoes have thin skins, and leaving them on is fine if they are scrubbed well; the soup may have a slightly more rustic appearance. Peeling gives the puree a more uniformly smooth finish. Russet potatoes also work, though they can make the soup fluffier and thicker, so you may need a little extra broth.

Can I make it without a blender?

Yes, although the texture will be different. Mash the cooked potatoes thoroughly with a potato masher and chop the wilted lettuce very finely before stirring it in. The result will be a rustic soup with visible pieces rather than a smooth puree. A countertop blender or immersion blender produces a more even texture, but neither is essential.

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