Grilled Kielbasa with Caramelized Onions and Spicy Mustard Sauce

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · ·

Smoky Polish kielbasa grilled to perfection, topped with sweet caramelized onions and served alongside a tangy, spicy mustard dipping sauce. This polish-inspired grilling ready in about 40 minutes blends large, thinly sliced yellow onion, olive oil, brown sugar into a versatile sauce that lifts everything from grain bowls and roasted vegetables to grilled proteins — a small-batch staple worth keeping in the fridge. Each serving lands at about 350 calories and feeds 4, so a small batch covers several meals across the week without taking over the fridge. 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: 30 min Serves 4 Polish cuisine 350 cal/serving
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Ingredients

Instructions

  1. Step 1: Heat 2 tbsp olive oil in a large skillet over medium heat. Add 2 thinly sliced large yellow onions with 1 tbsp brown sugar, 1/2 tsp salt, and 1/4 tsp black pepper. Cook, stirring occasionally, for 20-25 minutes until onions are deeply golden and caramelized.
  2. Step 2: Meanwhile, preheat grill to medium-high heat (about 400°F). Toss 1 lb sliced kielbasa with 1 tbsp olive oil.
  3. Step 3: Grill kielbasa slices for 3-4 minutes per side until grill marks form and edges are slightly crispy.
  4. Step 4: In a small bowl, whisk together 3 tbsp Dijon mustard, 2 tbsp whole grain mustard, 1 tsp hot sauce, and 1 tbsp apple cider vinegar until smooth.
  5. Step 5: Arrange grilled kielbasa on a serving platter, top with caramelized onions, drizzle with spicy mustard sauce, and sprinkle 2 tbsp chopped fresh parsley over the top.

Equipment for this recipe

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Frequently asked questions

How long does Grilled Kielbasa with Caramelized Onions and Spicy Mustard Sauce take to make?

Total time is about 40 minutes (10 min prep + 30 min cook). A small batch typically covers several meals in the week — store as the recipe directs.

How do I store leftover Grilled Kielbasa with Caramelized Onions and Spicy Mustard Sauce?

Transfer to an airtight jar and refrigerate for up to 5–7 days. Most sauces freeze well for up to 2 months — portion into small containers or freezer bags so you can thaw only what you need. Stir before serving; cream- or yogurt-based sauces may separate on standing.

Can I substitute ingredients in Grilled Kielbasa with Caramelized Onions and Spicy Mustard Sauce?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Grilled Kielbasa with Caramelized Onions and Spicy Mustard Sauce for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Grilled Kielbasa with Caramelized Onions and Spicy Mustard Sauce?

Polish grilling like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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