Pan-Seared Kielbasa with Caramelized Onions and Mustard Sauce

By AislePrompt Editorial · Published 2026-05-22 · Updated 2026-05-22

How this recipe was made — this recipe was drafted by AislePrompt's AI-assisted pipeline from technique templates and USDA-sourced nutrition data, and published by AislePrompt Editorial — see how AislePrompt recipes are developed and reviewed.

Sliced Polish kielbasa pan-seared until edges crisp, served with sweet caramelized onions and a tangy mustard cream sauce. This Polish-inspired pork recipe, ready in about 45 minutes, pairs Polish kielbasa, yellow onion, unsalted butter for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 380 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 10 min Cook: 35 min Serves 4 Polish cuisine 380 cal/serving

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Ingredients

1 pound, sliced into 1/2-inch rounds Polish kielbasa
2 large, thinly sliced yellow onion
3 tablespoons unsalted butter
1 tablespoon olive oil
2 tablespoons Dijon mustard
1/4 cup heavy cream
1 tablespoon apple cider vinegar
1 teaspoon fresh thyme leaves
1/2 teaspoon salt
1/4 teaspoon black pepper

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Instructions

Step 1: Heat 1 tablespoon olive oil and 2 tablespoons unsalted butter in a large skillet over medium heat. Add 2 large thinly sliced yellow onions with 1/2 teaspoon salt and cook, stirring occasionally, for 20-25 minutes until deep golden and caramelized.
Step 2: Remove onions from skillet and set aside. In the same skillet, add remaining 1 tablespoon butter and increase heat to medium-high. Add 1 pound sliced Polish kielbasa and cook for 3-4 minutes per side until browned and edges are crispy.
Step 3: Reduce heat to low and stir in 2 tablespoons Dijon mustard, 1/4 cup heavy cream, 1 tablespoon apple cider vinegar, and 1 teaspoon fresh thyme leaves. Cook for 2 minutes until sauce thickens slightly.
Step 4: Return caramelized onions to the skillet and toss gently to coat everything in mustard sauce. Season with 1/4 teaspoon black pepper and serve hot.