Caldo verde is a well-known soup from northern Portugal, made with potatoes, thinly sliced greens, olive oil, and traditionally Portuguese chouriço. This approachable version turns those simple ingredients into a silky, filling bowl, while allowing for regional and family variations in the greens, sausage, and seasoning.
Ingredients
- 2 tablespoons (30 ml) extra-virgin olive oil, plus 1 teaspoon (5 ml) for the sausage
- 1 medium yellow onion, about 5 ounces (150 g), finely chopped
- 3 garlic cloves, about 0.3 ounces (9 g), minced
- 2 pounds (900 g) starchy potatoes, such as russets, peeled and cut into 1-inch (2.5 cm) pieces
- 8 cups (1.9 L) low-sodium chicken or vegetable stock, or water
- 1 dried bay leaf
- 1 teaspoon (6 g) fine salt, plus more to taste
- ¼ teaspoon (0.5 g) freshly ground black pepper, plus more to taste
- 6 packed cups (about 180 g) thinly sliced kale or collard greens, tough stems removed
- 8 ounces (225 g) Portuguese chouriço, sliced into thin rounds
- 1 tablespoon (15 ml) extra-virgin olive oil for finishing, optional
Instructions
- Prepare the vegetables. Rinse the greens well, remove the tough central ribs, and slice the leaves into very thin ribbons. Peel and cut the potatoes, chop the onion, mince the garlic, and slice the chouriço. Thin greens are important: they soften quickly and distribute through the soup instead of forming chewy clumps. Keep the potatoes roughly the same size so they become tender at about the same time.
- Soften the onion and garlic. Heat 2 tablespoons (30 ml) olive oil in a large, heavy pot over medium heat. Add the onion and cook for about 5 minutes, stirring now and then, until softened but not browned. Stir in the garlic and cook for 1 minute. If the garlic starts to take on color, lower the heat; browned garlic can make the broth taste bitter.
- Simmer the potatoes. Add the potatoes, stock or water, bay leaf, salt, and pepper. Bring the liquid to a gentle boil, then lower the heat so it simmers steadily. Partially cover the pot and cook for 22 minutes, or until a fork slides easily into the largest potato pieces. Check once or twice and adjust the heat if the liquid is boiling vigorously. Remove the bay leaf before blending.
- Blend the base. Use an immersion blender to purée the potatoes and cooking liquid until smooth, about 2 minutes. Keep the blender head submerged to reduce splashing. If using a countertop blender, work in small batches, leave room for steam to escape, and follow the blender’s hot-liquid instructions. The base should be creamy but still pourable; stir in a little water or stock if it seems too thick.
- Brown the chouriço. While the soup base is ready, heat 1 teaspoon (5 ml) olive oil in a skillet over medium heat. Add the chouriço rounds in a single layer and cook for about 8 minutes, turning once, until lightly browned and warmed through. Portuguese chouriço is commonly cured or smoked and ready to eat, so this step is for warming and flavor. If substituting uncooked fresh sausage, cook it separately until its center reaches 160°F (71°C); USDA FSIS lists that as the safe minimum for ground meat. Drain excess fat if the sausage releases more than a small amount.
- Finish with the greens. Stir the sliced greens into the blended soup and simmer gently for 5 minutes, until tender but still green. Stir in most of the chouriço, taste, and add salt or pepper if needed. Ladle into warm bowls and top with the remaining sausage and a small drizzle of olive oil, if you like. Serve while hot.
Tips
- Slice the greens finely. Traditional caldo verde is known for its very fine ribbons of leafy greens. A sharp knife makes this easier; stack a few leaves, roll them loosely, and cut across the roll. Avoid rolling too tightly, which can make the strips uneven and difficult to separate.
- Choose a suitable potato. Russets or another starchy potato break down smoothly and give the soup body. Waxy potatoes can work, but they may leave a less silky texture, so blend thoroughly. If the soup becomes too thick after standing, loosen it with hot stock or water a little at a time.
- Adjust the salt after adding sausage. Chouriço and packaged stock can both be salty. Starting with low-sodium stock and tasting at the end gives you more control. If you use water, the soup will taste lighter and more potato-forward; a good stock makes the savory flavor fuller.
- Use a practical greens substitute. Portuguese couve galega, a traditional leafy cabbage, may be hard to find. Thinly sliced collards are a useful substitute with a sturdy texture; curly or lacinato kale also works and tastes a little more pronounced. Remove thick ribs from any of these greens so they soften evenly.
Serving Suggestions
Serve caldo verde as a first course or as a simple main meal with crusty bread for dipping. A Portuguese-style roll or another sturdy bread is useful for catching the potato-rich broth. For a more substantial spread, pair the soup with a green salad dressed with olive oil and vinegar, or offer olives and sliced bread alongside it. The soup is filling, so a modest bowl can work well before a larger meal.
Bring the pot to the table if serving a group, with extra black pepper and olive oil available for finishing. Keep the greens and chouriço distributed through the pot by stirring gently before each ladle. If you prefer everyone to get an even amount of sausage, reserve the browned rounds and divide them among the bowls rather than stirring all of them in.
Variations
Make it vegetarian: Use vegetable stock or water and leave out the chouriço. For a savory topping, brown sliced mushrooms in olive oil and season them with black pepper and a pinch of smoked paprika. This changes the classic smoky sausage flavor, but keeps the soup hearty. You can also finish each bowl with a few drops of good olive oil.
Try a different sausage: Spanish chorizo, kielbasa, or another smoked sausage can stand in for Portuguese chouriço if that is what is available. Their seasoning and salt levels differ, so taste before adding extra salt. If the substitute is uncooked rather than cured or fully cooked, cook it separately to the appropriate safe temperature before adding it to the soup.
Make the texture chunkier: Instead of blending all the potatoes, remove about 2 cups (300 g) of cooked potato pieces with a slotted spoon before blending. Return them to the pot afterward and lightly mash a few against the side. The result is less smooth but still thick, with soft pieces in each spoonful.
Use water for a simpler broth: Many home cooks make potato-and-greens soup with water, relying on the onion, garlic, olive oil, and sausage for flavor. Water gives a clean, gentle base; stock tastes richer. If using water and omitting the sausage, season gradually and consider adding a little more olive oil or browned mushrooms to round out the flavor.
Storage and Reheating
Let the soup stop steaming heavily, then refrigerate it within 2 hours of cooking in shallow, covered containers. It keeps for 3 to 4 days in the refrigerator. The potatoes can thicken the broth as it chills, and the greens may darken slightly; both are normal. Store the sausage in the soup or separately, depending on whether you want to keep the topping distinct.
Reheat only the portion you plan to serve in a saucepan over medium-low heat, stirring occasionally and adding a splash of water or stock if needed. Heat leftovers to 165°F (74°C), checking with a food thermometer. Avoid a hard boil, which can break down the greens and make the soup splatter. For microwave reheating, use a microwave-safe bowl, cover loosely, stir partway through, and check that the soup reaches 165°F (74°C) throughout.
To freeze, cool and portion the soup into freezer-safe containers, leaving a little space for expansion. Freeze for up to 2 months for best quality. The potato texture may become slightly grainy after thawing, but blending or stirring it well while reheating helps. Thaw overnight in the refrigerator when possible, then reheat to 165°F (74°C). Refrigerate any leftovers promptly rather than leaving the pot at room temperature.
Frequently Asked Questions
What is caldo verde?
Caldo verde is a Portuguese soup associated with the north of the country. Its familiar form combines a potato-based broth with finely sliced leafy greens, olive oil, and often chouriço. Recipes differ from home to home, including the type of greens, how smooth the potatoes are, and whether sausage is served in the pot or on top.
Can I make caldo verde without a blender?
Yes. Mash the cooked potatoes directly in the pot with a potato masher until the broth is as smooth as you like. It will usually be more rustic than a fully blended version, but it will still thicken the soup. For a smoother result, press the potatoes through a food mill or potato ricer and stir them back into the liquid.
Can I use frozen kale?
Yes, though the texture will be softer and the ribbons less distinct than with fresh greens. Thaw frozen kale and squeeze out excess water before adding it. Start with about 4 cups (roughly 600 g) thawed kale, then add more to taste; package weights and how tightly the leaves are packed vary. Simmer just until hot and tender.
Is chouriço the same as Spanish chorizo?
They are related styles of sausage, but they are not identical. Portuguese chouriço and Spanish chorizo can differ in seasoning, texture, and curing, and products vary by producer. Spanish chorizo is a practical substitute in this soup, but its flavor may be more strongly seasoned or smoky. Check the package to see whether it is ready to eat or needs cooking.
Why did my soup become very thick?
Potatoes release starch, and the soup continues to thicken as it cools or sits in the refrigerator. Stir in hot water or stock a few tablespoons at a time while reheating until it reaches the consistency you want. Taste again after thinning, since added liquid can dilute the seasoning.
Can I make it ahead?
Yes. Make the potato base up to 3 days ahead and refrigerate it promptly, then reheat it and add the greens shortly before serving so they keep a fresher color and texture. Brown the chouriço separately and add it at the end. If the base has thickened in the refrigerator, loosen it with stock or water as it warms.
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