Ingredients
Key Ingredients & Substitutions
Smoked Kielbasa – 2 pounds
Dijon Mustard – 2 tablespoons
Caraway Seed – ½ teaspoon
Salt & Pepper – to taste
2 pounds Smoked kielbasa (or hunters sausage, cut into slices or cubed)
2 pounds Sauerkraut (drained and chopped)
2 large Onions (diced)
3 tablespoons Butter (softened)
2 tablespoons Brown sugar
2 tablespoons Dijon mustard
1/2 teaspoon Caraway seed
Salt and pepper (to taste)
Directions
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1. Prepare the Slow Cooker
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Lightly spray or butter your 5-quart slow cooker to prevent sticking. You can also make this in a large stovetop pot on low heat if you prefer.
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(Tip: A light layer of fat helps prevent scorching and makes cleanup easier.)
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2. Layer the Ingredients
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Add the diced onions to the bottom of the slow cooker. Then add the drained, chopped sauerkraut, spreading it evenly. Finally, layer the sliced kielbasa on top of the sauerkraut.
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3. Make the Sauce
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In a small bowl or measuring cup, whisk together the softened butter, mustard, and brown sugar until creamy and smooth.
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4. Pour and Cook
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Drizzle the sauce mixture evenly over the kielbasa and kraut. Cover and cook on low for 4–5 hours.
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5. Stir and Serve
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Before serving, stir gently to mix everything together and blend the flavors. Season with salt and pepper if needed. Serve hot with your favorite sides.
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Tips for the Best Kielbasa and Sauerkraut
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Drain the sauerkraut well so the dish doesn’t become too watery.
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Don’t skip the mustard and sugar—they mellow and balance the flavor beautifully.
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Use good-quality kielbasa for the best results—smoked is key here.
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Chop the sauerkraut if it’s long and stringy—this makes the dish easier to eat and mix.
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Want more punch? Add a splash of apple cider vinegar or a bit of caraway seed.
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Make-Ahead Tips
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You can prep this dish entirely the night before—just layer the ingredients in the slow cooker insert, cover, and refrigerate. In the morning, pop it into the base and start cooking. The flavors deepen beautifully as it sits.
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Storage
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Once cooled, transfer leftovers to an airtight container and store in the fridge for up to 4 days. It actually tastes even better the next day.
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To Reheat:
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Reheat gently in a skillet over medium heat or microwave in 60-second intervals, stirring in between. You can also pop it back into the slow cooker on low for 1 hour if you’re feeding a crowd.
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Common Mistakes
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Over-seasoning from the start: Both kielbasa and sauerkraut can be salty on their own. Always taste before adding extra salt at the end.
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Not draining sauerkraut: Excess moisture can water down the dish and make it too sour. Drain well and give it a rough chop for a better texture.
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Skipping the sauce: The butter, brown sugar, and mustard aren’t optional flavor boosters—they bring the whole dish together with richness, sweetness, and tang.
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Serving Suggestions
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Because this Kiełbasa z Kapustą is very flavorful I recommend serving it with a side dish of your choice. My favorite is freshly baked Sourdough bread or French baguette, but you can also serve it with potatoes, or as a side dish to your meal.
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Prepare the Slow Cooker: Begin by lightly coating the crock of a 5-quart (or larger) slow cooker with cooking spray to prevent sticking. You can also cook this dish in a large pot on a slow heat.
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Layer the Ingredients: Spread the diced onions at the bottom of the crock in an even layer. Top with the drained sauerkraut, ensuring an even distribution. Place the sliced smoked kielbasa on top of the sauerkraut.
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Mix the Sauce: In a small mixing bowl or a measuring cup, whisk together the butter, mustard, and brown sugar until well combined.
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Cook the Dish: Pour the mixture evenly over the kielbasa and sauerkraut. Cover the slow cooker and set it to cook on low for 4-5 hours.
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Final Touches: Before serving, gently stir to combine the kielbasa slices with the onion and sauerkraut mixture to ensure that the flavors are well integrated.
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Serve and Enjoy: Garnish with dried parsley flakes if desired. This dish pairs wonderfully with mashed potatoes or fresh bread.
Notes
In order to add more flavor you can add cubed smoked bacon into the pot. This will make it even tastier.
Taste the sauce mixture before adding to the slow cooker. Adjust the amount of brown sugar based on your preference for sweetness.
Consider serving this dish as part of a larger meal, including other Polish favorites like pierogi or a simple cucumber salad for contrast.
This dish can be prepared ahead of time and stored in the refrigerator overnight. The flavors often deepen, making leftovers a treat.