German Lentil Soup with Sausage: Hearty and Simple

German lentil soup with sausage is a hearty one-pot soup of lentils, vegetables, potatoes, and smoky sausage, often finished with a little vinegar. Recipes vary by region and household; this version is easy to make with supermarket brown or green lentils and fully cooked smoked sausage.

Ingredients

1 tablespoon (15 ml) neutral oil, such as canola
12 ounces (340 g) fully cooked smoked sausage, such as kielbasa or German-style Wiener sausages, cut into ½-inch (1.25 cm) pieces
1 medium yellow onion, about 1 cup chopped (150 g)
2 medium carrots, about 1 cup diced (150 g)
2 celery ribs, about ¾ cup diced (90 g)
2 garlic cloves, finely chopped (about 6 g)
1½ cups (300 g) brown or green lentils, picked over and rinsed
2 medium Yukon Gold or other waxy potatoes, about 2 cups diced (300 g)
6 cups (1.42 L) low-sodium chicken or vegetable broth
1 bay leaf
1 teaspoon (2 g) dried thyme
½ teaspoon (1 g) freshly ground black pepper
¾ teaspoon (4.5 g) fine salt, plus more to taste
1 tablespoon (15 ml) apple cider vinegar, plus more to taste
2 tablespoons (8 g) chopped fresh parsley

Instructions

Prepare the ingredients. Dice the onion, carrots, celery, and potatoes into roughly even pieces so they cook at a similar pace. Pick through the lentils for small stones or debris, then rinse them under cool water. Cut the cooked sausage into bite-size pieces. Lentils do not need soaking for this recipe.
Brown the sausage. Heat the oil in a large, heavy pot or Dutch oven over medium heat. Add the sausage and cook for about 5 minutes, turning the pieces occasionally, until lightly browned in spots. Transfer it to a plate. Browning adds a savory note, but if you are short on time you can skip it and add the sausage near the end instead.
Soften the vegetables. Add the onion, carrots, and celery to the pot. Cook for about 6 minutes, stirring now and then, until the onion is translucent and the vegetables begin to soften. Stir in the garlic and cook for 1 minute, just until fragrant; avoid letting it brown, which can make it taste bitter.
Simmer the lentils and potatoes. Stir in the rinsed lentils, diced potatoes, broth, bay leaf, thyme, pepper, and salt. Bring the soup to a boil, then lower the heat so it bubbles gently. Cover the pot with the lid slightly ajar and simmer for 40 minutes, stirring once or twice. Check that the lentils are tender and the potatoes can be pierced easily with a fork. If the lentils are still firm, continue simmering and check every 5 minutes; older lentils can take longer.
Warm the sausage and finish. Stir the browned sausage back into the soup for the final 10 minutes of simmering, so it heats through without becoming tough. If using raw ground-pork sausage instead of fully cooked smoked sausage, cook it to 160°F (71°C), the USDA FSIS safe minimum for ground meat, checked with a food thermometer. Remove the bay leaf. Stir in the vinegar and parsley, then taste and adjust the salt, pepper, or vinegar. Serve hot.

Tips

Use lentils that hold their shape. Brown or green lentils are reliable in this soup. Red lentils soften and break down much more quickly, so they make a thicker, less distinct texture; if using them, shorten the simmer and check frequently.
Adjust the broth rather than overcooking. The soup thickens as lentils absorb liquid, especially after standing. Add a splash of broth or water if it becomes thicker than you like. Keep the simmer gentle: a hard boil can split the lentils and make the potatoes fall apart.
Season in stages. Smoked sausage and packaged broth can both be salty. Start with the listed salt, then taste after the sausage and vinegar have been added. A small extra splash of vinegar can brighten a flat-tasting pot without requiring more salt.
Choose a practical sausage substitute. German Mettwurst or Wiener sausages give a familiar savory, smoky character, but may be difficult to find. Fully cooked kielbasa or another smoked sausage works well; it may be more garlicky or smoky, so adjust the final seasoning to suit it.

Serving Suggestions

Serve the soup in warm bowls with crusty rye bread, sourdough, or a dense whole-grain loaf for dipping. A spoonful of mustard on the side is a good match for smoky sausage, while a simple green salad with a tart vinaigrette balances the soup’s earthy, filling texture. For a more traditional German-style meal, offer bread and let each person add extra vinegar at the table.

The soup is substantial enough to serve as a main course, but smaller bowls also work as a first course before roasted vegetables or a simple roast. Put chopped parsley, black pepper, and a bottle of cider vinegar on the table so diners can finish their own portions. If serving a crowd, keep the soup warm over low heat and stir occasionally; add broth if it thickens while waiting.

Variations

Try a Swabian-inspired serving: In parts of southwestern Germany, lentils are commonly served with spätzle and sausage. Spoon this soup over or alongside cooked spätzle rather than adding extra potatoes, or offer spätzle in place of bread. This makes a heartier plate and gives the meal a regional feel without requiring a change to the soup’s basic method.

Use bacon or smoked pork: For a deeper smoky base, cook 3 ounces (85 g) diced bacon in the pot before the vegetables, then use its rendered fat in place of the oil. Reduce the added salt because bacon can be salty. You can still include sausage, or leave it out and add 8 ounces (225 g) diced fully cooked smoked ham near the end.

Make it vegetarian: Use vegetable broth and omit the sausage. Add 1 teaspoon (5 ml) smoked paprika with the garlic for a little smoky flavor, or stir in 8 ounces (225 g) sliced mushrooms and brown them with the vegetables. The soup will be less meaty and smoky than the sausage version, but lentils and potatoes keep it satisfying.

Change the acidity or herbs: Apple cider vinegar is convenient and gently tart; white wine vinegar is a suitable substitute, while malt vinegar has a stronger flavor. Start with a smaller amount of any substitute and add more after tasting. A little chopped marjoram can replace some of the thyme for a more distinctly German-inspired herbal note.

Storage and Reheating

Cool leftovers promptly and refrigerate them within 2 hours of cooking in shallow, airtight containers. The soup keeps for 3–4 days in the refrigerator. It will thicken as it chills, so stir in a little water or broth when reheating. Reheat a portion on the stove over medium-low heat, stirring until steaming throughout; leftovers should reach 165°F (74°C), checked with a food thermometer. In a microwave, cover loosely, stir partway through, and check the temperature in several spots.

For longer storage, freeze the cooled soup in meal-size airtight containers for about 2–3 months for best quality. Leave a little space at the top for expansion and label the containers with the date. Thaw overnight in the refrigerator when possible, then reheat to 165°F (74°C). Potatoes may become a little softer after freezing, but the soup will still be flavorful. Avoid repeatedly cooling and reheating the full pot; warm only the portions you plan to eat.

Frequently Asked Questions

Do I need to soak lentils before making this soup?

No. Brown and green lentils cook in the simmering broth without a soak. Rinse them and pick out any debris first. Soaking is unnecessary here and can make the cooking time harder to predict; simply allow extra simmering time if your lentils are older or still firm at the 40-minute check.

Can I make German lentil soup ahead of time?

Yes. The soup can be cooked a day ahead and refrigerated once it has cooled enough to store safely. Its flavor settles and the broth thickens as it rests. Reheat it gently, adding broth or water to loosen it, and bring leftovers to 165°F (74°C). Add a fresh splash of vinegar or parsley just before serving if the flavor needs brightening.

What kind of sausage works best?

Fully cooked smoked sausage is convenient because it only needs browning and warming. Kielbasa, smoked German-style sausage, and cooked Wiener sausages are practical options; each brings a slightly different seasoning and texture. If you use raw sausage, cook it thoroughly before serving and follow the recipe’s thermometer guidance for ground pork.

Why are my lentils still hard?

Lentils can take longer to soften if they are old, and hard water may also slow cooking. Keep the pot at a gentle simmer and check the lentils every 5 minutes after the recipe’s 40-minute estimate. Avoid adding vinegar or another acidic ingredient until they are tender, because acid can slow softening. Add more broth if needed to keep them covered.

Can I make the soup without potatoes?

Yes. Omit the potatoes and keep the rest of the method the same. The broth will be a little less thick and the soup less filling, so serve it with bread or spätzle. You can add another ½ cup (100 g) of lentils for a heartier version, along with about 1 cup (240 ml) extra broth, and simmer until tender.

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

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