Heirloom Turkish Black Carrot Soup with Red Lentils

Heirloom Turkish black carrot soup is a vivid, gently earthy bowl of purple carrots, red lentils, onion, and warm spices, finished with lemon and a cool spoonful of yogurt. Black carrots are familiar in Turkey, especially as an ingredient in şalgam, a fermented drink; this soup is a Turkish-inspired home-style recipe rather than one definitive traditional version.

Ingredients

1 tablespoon (15 ml) olive oil
1 tablespoon (14 g) unsalted butter, or use another tablespoon (15 ml) olive oil to keep the soup dairy-free
1 medium yellow onion, about 1 cup chopped (150 g)
2 garlic cloves, finely chopped (6 g)
1 pound heirloom black carrots, peeled and diced into ½-inch pieces (450 g); purple carrots are a suitable substitute
1 medium Yukon Gold or russet potato, peeled and diced (about 1 cup or 180 g)
⅓ cup red lentils, rinsed and drained (65 g)
1 teaspoon ground cumin (2 g)
½ teaspoon ground coriander (1 g)
¼ teaspoon Aleppo pepper or Turkish pul biber, plus more to serve (about 0.5 g); use mild chili flakes or sweet paprika if unavailable
5 cups low-sodium vegetable broth (1.2 L)
¾ teaspoon fine salt (4 g), plus more to taste
¼ teaspoon freshly ground black pepper (0.5 g)
2 tablespoons fresh lemon juice (30 ml), plus lemon wedges for serving
½ cup plain whole-milk yogurt (120 g), for serving; use unsweetened plant-based yogurt if desired
2 tablespoons chopped fresh flat-leaf parsley (8 g), for serving

Instructions

Prepare the vegetables. Peel the carrots and potato, then cut them into small, even pieces, roughly ½ inch (1.25 cm) across. Chop the onion and garlic. Rinse the red lentils in a fine sieve until the water runs mostly clear. The purple pigment can stain cutting boards and pale towels, so use a nonporous board or wipe it promptly. This preparation takes about 20 minutes.
Soften the onion. Heat the olive oil and butter in a large, heavy-bottomed pot over medium heat. Add the onion and cook for 5 minutes, stirring now and then, until softened and translucent but not browned. If the onion starts to catch, lower the heat and add a tablespoon of broth rather than letting it scorch.
Bloom the garlic and spices. Add the garlic, cumin, coriander, and Aleppo pepper. Stir for about 1 minute, just until fragrant. Keep the heat moderate: ground spices can turn bitter if they burn, and garlic should not become dark brown.
Add the carrots, potato, lentils, and broth. Stir in the diced carrots and potato, then the rinsed lentils, broth, salt, and black pepper. Scrape the bottom of the pot to loosen any flavorful bits. Bring the liquid to a gentle boil, then reduce the heat so it simmers steadily. Cover the pot partially.
Simmer until tender. Cook for 25 minutes, stirring once or twice. The carrots and potato should be easily pierced with a fork, and the lentils should be soft and beginning to break down. If the vegetables are still firm, simmer for a few minutes longer; carrot size and age can affect the timing. If the pot looks unusually thick before the vegetables are tender, add broth or water ¼ cup (60 ml) at a time.
Blend and season. Take the pot off the heat. Blend with an immersion blender until smooth, keeping the blender head beneath the surface to reduce splashing. Alternatively, blend in batches in a countertop blender, filling it no more than halfway and venting the lid according to its instructions because hot soup expands. Stir in the lemon juice, taste, and adjust the salt, pepper, or lemon. This blending and finishing stage takes about 5 minutes.
Serve. Ladle into warm bowls and add a spoonful of yogurt, parsley, and a pinch of Aleppo pepper. Offer lemon wedges at the table so each person can brighten the soup to taste.

Tips

Choose the right carrots. Heirloom black carrots are often sold as purple carrots, and the shade can range from deep violet to nearly black outside with a lighter center. If a specialty grocer or farmers’ market does not have them, ordinary purple carrots work well. Orange carrots also make a tasty soup, but the color will be orange rather than the deep wine-purple hue.
Cut pieces evenly. Small, similar-sized pieces cook at a predictable pace. Large chunks may leave the soup with firm carrot bits while the lentils have already softened, so take a moment to dice the root vegetables evenly.
Adjust thickness after blending. Red lentils and potato both thicken the soup. For a looser texture, stir in warm broth a little at a time; for a thicker bowl, simmer the blended soup gently for a few minutes. Avoid a hard boil after blending, which can make splashes and may cause dairy toppings to separate if they are already mixed in.
Use lemon and yogurt at the end. Acid and dairy are easiest to balance at serving. Add lemon gradually, and keep the yogurt as a topping rather than stirring it into the whole pot if you plan to store or freeze portions.

Serving Suggestions

Serve the soup as a light lunch or as the first course of a larger meal. Warm pide, crusty bread, or flatbread is useful for dipping and makes the meal more substantial. A simple salad of cucumber, tomato, herbs, and a tart dressing gives a crisp contrast to the soup’s smooth texture. For a fuller spread, offer olives, sliced radishes, or a small plate of roasted vegetables alongside it.

The yogurt garnish adds a cool, creamy counterpoint, while parsley and lemon keep the bowl lively. For a dairy-free table, leave off the yogurt or use plain, unsweetened plant-based yogurt. A small drizzle of olive oil and a pinch of pul biber are also good toppings. Add garnishes just before serving so the herbs stay fresh and the yogurt remains distinct against the purple soup.

Variations

Make it vegan: Replace the butter with olive oil and use vegetable broth, as written. Omit dairy yogurt or choose an unsweetened plant-based alternative. The soup remains rich in texture because the lentils and potato provide body.

Make it more gently spiced: Leave out the Aleppo pepper and use a pinch of sweet paprika instead. For a warmer, more pronounced spice profile, add another ¼ teaspoon cumin, but taste before adding extra chili. Aleppo pepper and pul biber are mildly fruity compared with many hot chili flakes; generic flakes may make the soup noticeably hotter.

Add a brighter herb finish: Use chopped dill or mint in place of some or all of the parsley. A little finely grated lemon zest can also sharpen the aroma. Add herbs to individual bowls rather than simmering them in the pot, since long cooking dulls their fresh flavor.

Leave it slightly textured: Blend only about three-quarters of the soup, then stir the purée back into the pot. This keeps some soft lentils and carrot pieces in each spoonful. The soup will look less uniform, but it will still have a creamy consistency without adding cream.

Storage and Reheating

Refrigerate leftover soup within 2 hours of cooking. Transfer it to shallow, covered containers so it cools promptly, and keep the yogurt and fresh herbs separate. The soup keeps for 3–4 days in the refrigerator. It may thicken as the lentils absorb liquid, so loosen each portion with a splash of broth or water when reheating.

Reheat only the portion you plan to eat, stirring often over medium-low heat until steaming throughout. For food safety, leftovers should reach 165°F (74°C); check with a food thermometer, especially when reheating a large batch. In a microwave, cover the bowl loosely, stir at intervals, and check the temperature in more than one spot. Add yogurt and herbs after reheating.

For longer storage, freeze the soup without its toppings in freezer-safe containers, leaving a little room for expansion. It is best used within 2–3 months for flavor and texture. Thaw overnight in the refrigerator, then reheat to 165°F (74°C). The texture may be slightly less silky after freezing; whisk it or briefly blend it again after reheating. Do not leave the soup at room temperature for extended storage.

Frequently Asked Questions

Are black carrots the same as purple carrots?
In everyday produce listings, the names are often used for the same deep-colored carrot varieties. Their skin and flesh can vary in shade, so a carrot sold as purple may look more burgundy or nearly black. Either is appropriate here. The color can also vary somewhat after cooking, especially when the soup is combined with pale potato and broth.

Where can I find heirloom black carrots?
Look at farmers’ markets, specialty produce shops, and grocery stores with a broad selection of root vegetables. They may be labeled black, purple, or heritage carrots. If you cannot find them, purple carrots are the closest visual substitute, while orange carrots work for flavor and texture but produce a different-looking soup.

Can I make this soup without a blender?
Yes. For a rustic version, mash the cooked carrots and potato against the side of the pot with a potato masher, then stir well to break up the lentils. The result will be chunky rather than smooth. A countertop blender or immersion blender gives a more even texture, but neither is essential to the flavor.

Why is my soup thicker after it sits?
Red lentils and potato continue to absorb liquid as the soup cools and rests, so a batch that was pourable at first may become quite thick in the refrigerator. Stir in warm broth or water a little at a time when reheating until it reaches the consistency you like. Season again afterward, since added liquid can soften the taste.

Can I prepare it ahead for guests?
Yes. Make the soup up to 3 days ahead and refrigerate it promptly, then reheat it gently to 165°F (74°C) before serving. Prepare the garnishes separately and add them at the table. If the soup is too thick after chilling, thin it with broth while reheating, then adjust the lemon and salt once it is hot.

Will the carrots stain my equipment?
The pigment may temporarily mark light-colored plastic, porous wood, or fabric. A glass or stainless-steel pot is a good choice, and a nonporous cutting board is convenient. Wipe splashes and wash the board soon after cutting; avoid leaving damp carrot juice on pale cloth or an unsealed surface.

More recipes to cook

Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

Spotted an error? Tell us and we will correct it (corrections policy).