Caramelized Onion Pasta with Chili Oil Recipe
Introduction
This Caramelized Onion Pasta with Chili Oil combines sweet, slowly cooked onions with a spicy, flavorful oil for a simple yet satisfying meal. It’s a quick dish that transforms basic ingredients into something special and comforting.

Ingredients
- 8 oz pasta of your choice
- 2 large onions, thinly sliced
- 2 tablespoons butter
- 2 tablespoons chili oil
Instructions
- Step 1: In a large skillet over medium-low heat, melt the butter. Add the sliced onions and cook slowly, stirring occasionally, until they turn a deep golden brown and caramelize, about 25-30 minutes.
- Step 2: Meanwhile, cook the pasta according to the package instructions until al dente. Drain and reserve a little pasta water.
- Step 3: Toss the pasta with the caramelized onions and chili oil. If needed, add a splash of reserved pasta water to loosen the sauce. Serve warm.
Tips & Variations
- For extra richness, stir in a sprinkle of grated Parmesan or crumbled feta before serving.
- Use homemade chili oil or adjust the amount to control the spice level.
- Add fresh herbs like parsley or basil to brighten the dish.
Storage
Store leftover pasta in an airtight container in the refrigerator for up to 3 days. Reheat gently in a skillet or microwave, adding a splash of water or oil to keep it moist.
How to Serve
Serve this delicious recipe with your favorite sides.
FAQs
Can I use other types of onions for this recipe?
Yes, yellow or sweet onions work best for caramelizing due to their natural sugars, but red onions can be used for a slightly different flavor.
Is chili oil necessary?
Chili oil adds a spicy kick and depth of flavor, but you can substitute it with olive oil and add chili flakes if preferred.
PrintCaramelized Onion Pasta with Chili Oil Recipe
A simple and flavorful pasta dish featuring sweet, caramelized onions combined with a spicy kick from chili oil. Perfect for a quick and satisfying meal that balances savory and heat.
- Prep Time: 10 minutes
- Cook Time: 40 minutes
- Total Time: 50 minutes
- Yield: 2 servings 1x
- Category: Main Course
- Method: Stovetop
- Cuisine: Italian
Ingredients
Pasta
- 200g dried pasta (spaghetti or linguine)
Caramelized Onions
- 2 large yellow onions, thinly sliced
- 2 tablespoons unsalted butter
Chili Oil
- 2 tablespoons chili oil (adjust to taste)
Instructions
- Prepare the onions: Peel and thinly slice the onions to ensure even caramelization.
- Caramelize the onions: Heat butter in a large skillet over medium-low heat. Add the sliced onions and cook slowly, stirring occasionally, until they turn golden brown and soft, about 30-40 minutes. This slow cooking brings out the onions’ natural sweetness.
- Cook the pasta: While the onions caramelize, bring a large pot of salted water to a boil. Add the pasta and cook according to package instructions until al dente. Drain the pasta, reserving a small amount of pasta water.
- Toss with chili oil: Return the pasta to the pot or a large bowl. Add the caramelized onions and chili oil, tossing gently to combine. Use a little reserved pasta water if needed to loosen the sauce and help everything coat the pasta evenly.
- Serve: Plate the pasta immediately while warm, optionally garnishing with fresh herbs or grated cheese if desired.
Notes
- Slow caramelization of onions is key to developing deep flavor; don’t rush or use high heat.
- Adjust the amount of chili oil based on your preferred spice level.
- You can add grated Parmesan or fresh basil for extra flavor.
- Use good quality chili oil for the best taste.
- If unavailable, you can make your own chili oil by infusing olive oil with red pepper flakes.
Keywords: caramelized onion pasta, chili oil pasta, easy pasta recipe, quick Italian dinner, spicy pasta dish, vegetarian pasta

