Lentil SoupsPolish-AmericanEasy

One-Pot Lentil Soup with Kielbasa and Bell Peppers

Name: One-Pot Lentil Soup with Kielbasa and Bell Peppers
Prep time: 15 min
Cook time: 35 min
Total time: 50 min
Yield: 6 servings
Cuisine: Polish-American
Ingredients: 1½ cups (300 g) brown lentils, rinsed and picked through, rinsed under cold water, debris removed; 6 cups (1440 ml) low-sodium chicken broth; 1 cup (240 ml) water; 12 oz (340 g) kielbasa sausage, sliced into ¼-inch (6 mm) thick rounds; 1 large (250 g) red bell pepper, large, diced into ½-inch (1.3 cm) pieces; 1 large (250 g) yellow bell pepper, large, diced into ½-inch (1.3 cm) pieces; 1 medium (150 g) yellow onion, medium, diced into ½-inch (1.3 cm) pieces; 3 cloves (15 g) garlic cloves, fresh, minced; 2 tablespoons (30 ml) extra-virgin olive oil; to taste kosher salt; to taste freshly ground black pepper; 1 leaf bay leaf, fresh or dried; 2 sprigs fresh thyme sprigs (optional); ½ teaspoon (1½ g) caraway seeds (optional)

From the MyKitchenBank Kitchen

A hearty, rustic stovetop soup that combines tender brown lentils, sliced kielbasa sausage, and sweet bell peppers in a savory chicken broth base. This budget-friendly, one-pot meal delivers rich flavor with minimal cleanup—perfect for weeknight dinners or meal prep. The lentils thicken the broth naturally while the kielbasa adds smoky depth.

Prep: 15 min
Cook: 35 min
Total: 50 min
Makes: 6 servings (about 2 quarts / 1.9 liters)

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Ingredients

6 servings

1½ cups (300 g) brown lentils, rinsed and picked through, rinsed under cold water, debris removed
6 cups (1440 ml) low-sodium chicken broth
1 cup (240 ml) water
12 oz (340 g) kielbasa sausage, sliced into ¼-inch (6 mm) thick rounds
1 large (250 g) red bell pepper, large, diced into ½-inch (1.3 cm) pieces
1 large (250 g) yellow bell pepper, large, diced into ½-inch (1.3 cm) pieces
1 medium (150 g) yellow onion, medium, diced into ½-inch (1.3 cm) pieces
3 cloves (15 g) garlic cloves, fresh, minced
2 tablespoons (30 ml) extra-virgin olive oil
to taste kosher salt
to taste freshly ground black pepper
1 leaf bay leaf, fresh or dried
2 sprigs fresh thyme sprigs (optional)
½ teaspoon (1.5 g) caraway seeds (optional)

Equipment (5)

Large heavy-bottomed pot (5-quart / 4.7 L minimum)
Wooden spoon
Cutting board
Chef's knife
Can opener (if using canned broth)

Steps

Before you start

Rinse the brown lentils under cold water and pick through them for any small stones or debris
Have all ingredients prepped and ready before you start cooking
Use a pot with at least 5-quart (4.7 L) capacity

1
Sauté aromatics
- Heat the olive oil in a large 5-quart (4.7 L) pot over medium heat.
- Once shimmering, add the diced onion and cook for 3–4 minutes, stirring occasionally, until softened and just beginning to turn translucent.
- Add the minced garlic and cook for another 30 seconds until fragrant.
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Ready when: Onion is translucent; garlic smells fragrant
Tip: Avoid browning the garlic, which will turn bitter. Stir frequently.
2
Build the base
- Add the kielbasa slices to the pot and cook for 2 minutes, stirring occasionally, until they begin to release their oils and develop a light golden color on the edges.
- This adds depth to the broth.
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Ready when: Kielbasa edges show light golden color
Tip: You're not browning the sausage heavily—just warming it to release flavor.
3
Add liquid and lentils
- Pour in the chicken broth and water.
- Add the rinsed brown lentils, bay leaf, and thyme sprigs (if using).
- Stir to combine.
- Increase the heat to medium-high and bring the mixture to a rolling boil.
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Ready when: Mixture reaches a rolling boil with large bubbles
Tip: Stir occasionally so lentils don't stick to the bottom.
4
Simmer lentils
- Once boiling, reduce heat to medium-low and let the soup simmer gently for 15 minutes, stirring occasionally.
- The lentils should begin to soften but still hold their shape.
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Ready when: Lentils are partially softened but not falling apart
Tip: Maintain a gentle simmer, not a vigorous boil, so lentils don't burst.
5
Add peppers and seasonings
- Stir in the diced red and yellow bell peppers.
- If using caraway seeds (traditional in Polish kielbasa soup), add them now.
- Season with salt and freshly ground black pepper to taste.
- Stir well.
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Tip: Add salt gradually and taste as you go—the broth will concentrate as the lentils absorb liquid.
6
Finish cooking
- Continue simmering for another 15–18 minutes, stirring occasionally, until the lentils are completely tender and the bell peppers are soft.
- The broth will have thickened slightly from the broken-down lentils.
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Ready when: Lentils are fully tender and easily mashed with a spoon; peppers are soft
Tip: If the soup becomes too thick, thin it with a splash of broth or water.
7
Final seasoning and serving
- Remove the bay leaf and thyme sprigs.
- Taste the soup and adjust seasoning with additional salt and pepper as needed.
- Ladle into bowls and serve hot, optionally with crusty bread or sour cream on the side.
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Tip: Remove the herb sprigs completely—bay leaves and thyme stems are not edible.

Good to know

Tips

Brown lentils are sturdier than red or yellow lentils and won't turn to mush during the long simmer—essential for a soup with good texture.
Caraway seeds are optional but add an authentic Polish flavor. If you don't have them, skip them; the soup is delicious without.
For a creamier texture, use an immersion blender to partially blend half the soup once cooked, then stir back in. Keep some texture by not puréeing completely.
This soup is even better the next day as the flavors meld together and the broth continues to thicken. Make it ahead for easy weeknight reheating.

Make ahead

Yes. Prepare the soup up to 1 day ahead, cover, and refrigerate. Reheat gently over medium-low heat on the stovetop, adding a splash of broth if it has thickened. The flavors actually improve after a day of sitting.

Storage & reheating

Room temperature: up to 2 hours. Refrigerator: up to 4 days in an airtight container. Freezer: up to 3 months. Reheat from frozen over medium heat, stirring occasionally and adding broth to reach desired consistency. The lentils may soften further upon reheating.

Substitutions

kielbasa sausage → Smoked turkey sausage or Polish sausage. Use a similar weight; adjust cook time if using a much leaner sausage.
brown lentils, rinsed and picked through → Green or French (Puy) lentils. Green lentils hold their shape better; reduce cook time to 25–30 minutes total.
red bell pepper, large → Additional yellow bell pepper or green bell pepper. Red peppers are slightly sweeter; use what you have on hand.
low-sodium chicken broth → Vegetable broth or beef broth. Beef broth will deepen the flavor; vegetable broth keeps it lighter.