Portuguese Kale Soup: Caldo Verde Explained

Portuguese kale soup is called caldo verde, or “green broth,” a soup from northern Portugal made with potatoes, thinly sliced kale, and often smoky Portuguese chouriço. This version blends some of the potatoes for a naturally creamy broth, then adds the kale and sausage for a hearty soup that can be served as a first course or a simple meal.

Ingredients

1 tablespoon (15 ml) olive oil
8 ounces (225 g) fully cooked Portuguese chouriço, cut into thin slices
1 medium yellow onion, about 1 cup (150 g) finely chopped
3 garlic cloves, about 1 tablespoon (15 g) minced
2 pounds (900 g) Yukon Gold or russet potatoes, peeled and cut into 1-inch (2.5 cm) pieces
6 cups (1.42 L) low-sodium chicken broth or vegetable broth
8 ounces (225 g) kale leaves, tough stems removed and leaves sliced very thinly; this is about 1 large bunch
½ teaspoon (3 g) fine salt, plus more to taste
¼ teaspoon (0.5 g) freshly ground black pepper, plus more to taste
1 tablespoon (15 ml) extra-virgin olive oil, for serving, optional

Instructions

Prepare the ingredients. Peel and cut the potatoes, chop the onion, mince the garlic, and remove the tough ribs from the kale. Stack a few kale leaves, roll them loosely, and slice across the roll into very fine ribbons. Thin slices soften quickly and are easier to eat in the finished soup. Cut the chouriço into thin rounds so a little smoky flavor reaches the broth with each bite.
Brown the chouriço. Heat the tablespoon of olive oil in a large, heavy soup pot over medium heat. Add the chouriço and cook for 6 to 8 minutes, turning occasionally, until it is lightly browned and has released some of its flavorful fat. Transfer it to a plate with a slotted spoon, leaving the oil in the pot. If using fresh, raw sausage instead of fully cooked smoked chouriço, cook it through and check that the center reaches 160°F (71°C); the USDA FSIS safe minimum temperature for ground meat is 160°F (71°C). For this recipe, fully cooked smoked sausage is the easier option.
Soften the onion and garlic. Add the onion to the pot and cook for about 5 minutes, stirring now and then, until softened and translucent. If the pot seems dry, add a tablespoon of broth rather than more oil. Stir in the garlic and cook for 30 seconds, just until fragrant; avoid browning it, which can make the flavor bitter.
Simmer the potatoes. Add the potatoes, broth, salt, and pepper. Scrape the bottom of the pot to loosen any browned bits, then bring the liquid to a boil. Reduce the heat to maintain a gentle simmer, cover the pot with the lid slightly ajar, and cook for 20 to 22 minutes. The potatoes are ready when a knife slides through the largest pieces without resistance. If they are still firm, give them a few more minutes rather than moving on too soon.
Make the broth creamy. Turn off the heat. Use an immersion blender to blend the potatoes into the broth, stopping when the soup is mostly smooth but still has a little texture. Alternatively, mash the potatoes directly in the pot with a potato masher. For a chunkier soup, mash only about half of them. Take care if using a countertop blender: hot liquid expands, so work in small batches, leave room at the top, and vent the lid according to the blender’s instructions.
Add the kale and sausage. Return the pot to medium-low heat and stir in the sliced kale and browned chouriço. Simmer gently, uncovered, for 8 to 10 minutes, stirring once or twice, until the kale is tender and the sausage is hot throughout. Avoid a hard boil at this stage; a gentle simmer keeps the kale from turning dull and helps the soup retain its fresh, savory flavor.
Season and serve. Taste the broth and add more salt or pepper if needed. Chouriço can be salty, so adjust only after it has simmered in the soup. Ladle into warm bowls and, if you like, finish with a small drizzle of extra-virgin olive oil.

Tips

Slice the kale very finely. Traditional caldo verde is known for narrow ribbons of greens rather than large leafy pieces. Remove the thick ribs first, then slice the leaves as thinly as practical. If the ribbons are especially long, cut them once or twice crosswise so they distribute neatly through the soup.
Choose the sausage with its flavor in mind. Portuguese chouriço is a smoked, seasoned sausage that gives the soup its characteristic savory, paprika-like depth. It may be sold at Portuguese or other international grocers. Spanish chorizo or linguiça is a useful substitute, though either can make the soup saltier or more assertively spiced; taste before adding extra salt. Avoid Mexican fresh chorizo as a direct swap unless you want a softer, more strongly seasoned result.
Control the texture with the potatoes. Yukon Gold potatoes make a smooth, buttery broth, while russets break down readily and give a thicker result. If the soup becomes thicker than you want, stir in hot broth or water a little at a time. If it seems thin, mash more potato into the liquid rather than adding flour or cream.
Keep an eye on the salt. Low-sodium broth leaves room to season at the end, and smoked sausage varies considerably in saltiness. If your broth is regular rather than low-sodium, start with less added salt and taste after the kale and sausage have simmered together.

Serving Suggestions

Serve caldo verde hot in shallow bowls, with crusty bread for dipping and a little olive oil at the table. In Portugal, it is often served as a starter, but the potatoes and sausage make this version substantial enough for lunch or a light supper. A simple green salad or sliced tomatoes can round out a meal without competing with the smoky broth.

If serving it as part of a larger meal, offer smaller bowls before roasted chicken, grilled fish, or a bean dish. For a casual dinner, put the pot on the table with extra pepper and bread so everyone can adjust their own bowl. The soup is filling, so a modest serving works well alongside other dishes.

Variations

Make it vegetarian. Leave out the chouriço and use vegetable broth. To replace some of the sausage’s savory depth, brown 8 ounces (225 g) of sliced mushrooms in the olive oil before cooking the onion, or add ½ teaspoon (1 g) smoked paprika with the garlic. The result will not have the same cured-meat flavor, but it remains a satisfying potato-and-kale soup. Check the seasoning at the end because the sausage would otherwise contribute salt.

Use another green. Collard greens are a sturdy substitute for kale; remove their thick ribs and slice them finely, then simmer until tender, allowing a few extra minutes if needed. Savoy cabbage also works, though it makes the soup milder and sweeter. Spinach can be used in a pinch, but it wilts much faster, so stir it in during the final 2 to 3 minutes instead of simmering it for the full kale time.

Make it less smoky or more substantial. Use half the chouriço for a gentler sausage flavor, or serve the sausage separately so diners can add it themselves. For a heartier bowl, add 1 cup (170 g) of drained white beans after blending the potatoes and warm them with the kale. This changes the traditional texture but pairs well with the broth and greens.

Adjust the consistency. For a rustic soup, mash the potatoes by hand and leave some chunks. For a silkier broth, blend more of the potatoes before adding the kale. Avoid blending the kale itself; doing so can make the soup overly smooth and muted in color, unlike the characteristic ribbons in caldo verde.

Storage and Reheating

Cool leftovers promptly and refrigerate them within 2 hours of cooking in a shallow, covered container. Caldo verde keeps for 3 to 4 days in the refrigerator. The potatoes absorb broth as the soup sits, so it will usually be thicker the next day; stir in a splash of water or broth when reheating to bring it back to the consistency you like.

Reheat a portion in a saucepan over medium-low heat, stirring occasionally until steaming hot throughout, or microwave it in a covered, microwave-safe bowl, stirring halfway through. Reheated leftovers should reach 165°F (74°C). Avoid repeatedly warming and cooling the full pot; heat only the amount you plan to serve.

For longer storage, freeze the soup in airtight, freezer-safe portions for up to 2 to 3 months for best quality. Kale and potatoes can soften after freezing, and the texture may be less silky when thawed. Thaw overnight in the refrigerator, then reheat gently and stir well. Add a little broth if the potatoes have thickened the soup. Do not leave the soup at room temperature for extended storage.

Frequently Asked Questions

What is Portuguese kale soup called?
Its best-known Portuguese name is caldo verde, which means “green broth.” It is associated with northern Portugal and is commonly made with potatoes, finely sliced greens, and chouriço. Family and regional recipes vary in how much potato is blended, which greens are used, and whether sausage is included.

Is caldo verde always made with kale?
No. Kale is common in versions made outside Portugal, but traditional recipes may use couve-galega, a Portuguese leafy cabbage that can be difficult to find elsewhere. Finely sliced kale is a practical substitute. Collards or cabbage can also work, though each gives the soup a slightly different flavor and texture.

Can I make caldo verde without chouriço?
Yes. Omit it and use vegetable broth for a vegetarian soup, or use chicken broth if you are simply avoiding sausage. Mushrooms and a small amount of smoked paprika can add savory, smoky notes, but they will not taste exactly like cured Portuguese chouriço. Taste before adding salt, especially if using seasoned broth.

Can I use frozen kale?
Yes. Frozen kale is convenient and does not need to be thawed first. Add it near the end, then simmer until hot and tender; the time depends on the size of the pieces. It may make the soup softer and less ribbon-like than fresh kale, but the flavor still suits the dish.

Why is my soup too thick?
Potatoes continue to absorb liquid as the soup stands, so a thickened pot is normal, especially after refrigeration. Stir in hot broth or water a few tablespoons at a time while reheating until it loosens. If it tastes diluted afterward, adjust the salt and pepper rather than adding a large amount of seasoning at once.

Can I prepare it ahead?
Yes. You can make the soup a day ahead and refrigerate it once cooled, within 2 hours of cooking. The flavors settle together, although the potatoes will thicken the broth and the kale may soften further. Reheat only what you need to 165°F (74°C), loosen it with broth if necessary, and adjust the seasoning just before serving.

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