Caramelized Onion and Garlic Spaghetti Recipe

Hi, I’m Sam from dishfoody.com, where simple ingredients transform into rich comfort food. This Caramelized Onion and Garlic Spaghetti features deeply sweet caramelized onions, fragrant garlic, and creamy sauce coating al dente spaghetti for an indulgent weeknight pasta. Perfect for date nights, cozy dinners, or feeding a hungry crowd.

Ready in about 45 minutes with pantry staples, the long caramelization rewards patience with unbeatable flavor.

Why This Recipe Works

• Slow-caramelized onions create natural sweetness and depth
• Heavy cream transforms into silky sauce without separation
• Garlic adds savory punch without burning
• Italian seasoning and red pepper balance richness with warmth
• Pasta water emulsifies sauce for perfect coating

Ingredients & Prep

• 8 oz spaghetti
• 2 tablespoons unsalted butter
• 2 tablespoons olive oil
• 1 large onion, thinly sliced
• 4 cloves garlic, minced
• 1 cup heavy cream
• 1 teaspoon Italian seasoning
• ½ teaspoon crushed red pepper (optional)
• 1 teaspoon salt (plus more for pasta water)
• 1 teaspoon black pepper
• 1 green onion, chopped
• Grated Parmesan cheese for serving
• Chili oil (optional)

Step-by-Step Instructions

1. Bring a large pot of salted water to boil. Cook spaghetti al dente; reserve ½ cup pasta water, then drain.
2. In a large skillet over medium, melt butter with olive oil. Add sliced onions and a pinch of salt.
3. Cook onions on low 25-30 minutes, stirring occasionally, until deeply golden. Add splashes of water if sticking.
4. Add minced garlic; sauté 1 minute until fragrant. Stir in Italian seasoning, red pepper, salt, and pepper.
5. Pour in heavy cream; simmer 2-3 minutes until slightly thickened.
6. Add cooked spaghetti and reserved pasta water; toss until creamy and well-coated.
7. Garnish with green onions, Parmesan, and chili oil. Serve hot.

Flavor Variations

Storage Tips

Store leftovers in airtight container in fridge up to 3 days. Reheat gently on stovetop with splash of milk or cream. Not ideal for freezing due to cream sauce separation.

FAQs

Onions burning? Lower heat and add water to deglaze pan.
Sauce too thick? Add more reserved pasta water while tossing.
Gluten-free? Use gluten-free spaghetti and check seasoning labels.

Conclusion

Caramelized Onion and Garlic Spaghetti delivers restaurant-quality richness with simple technique. Sweet onions, creamy sauce, and garlicky warmth make it irresistible. Find more pasta perfection at dishfoody.com.

Caramelized Onion and Garlic Spaghetti Recipe

Print Recipe

Caramelized Onion and Garlic Spaghetti features sweet, golden onions slowly cooked with garlic in butter, tossed with al dente spaghetti and fresh herbs for simple yet luxurious pasta.

• Author: ssam
• Prep Time: 15 mins
• Cook Time: 45 mins
• Total Time: 60 mins
• Yield: 4 servings 1x
• Category: Main Dish
• Method: Stovetop
• Cuisine: Italian
• Diet: Vegetarian

Ingredients

Scale 1x2x3x

• 12 oz spaghetti
• 3 large yellow onions, thinly sliced
• 6 garlic cloves, thinly sliced
• 4 tbsp unsalted butter
• 3 tbsp olive oil
• 1/2 cup grated Parmesan cheese
• 1/4 cup fresh parsley, chopped
• Salt and black pepper to taste
• 1 tsp sugar (optional)
• Red pepper flakes (optional)
• Reserve 1 cup pasta water

Instructions

• 1. Cook spaghetti in salted boiling water until al dente. Reserve 1 cup pasta water, drain.
• 2. Meanwhile, heat butter and olive oil in large skillet over medium-low. Add sliced onions and 1/2 tsp salt. Cook 30-40 minutes, stirring occasionally, until deep golden brown.
• 3. Add sliced garlic and sugar (if using). Cook 5 more minutes until garlic softens and onions caramelize fully.
• 4. Add cooked spaghetti to skillet with 1/2 cup pasta water. Toss to coat, adding more water if needed for silky sauce.
• 5. Remove from heat, stir in Parmesan and parsley. Season with black pepper and red pepper flakes. Serve immediately.

Notes

• Low and slow caramelization essential for onion sweetness.
• Don’t rush onions – 40 minutes minimum yields best flavor.
• Pasta water creates creamy sauce without cream.
• Top with extra Parmesan and serve with crisp green salad.

Nutrition

• Serving Size: 1 1/2 cups
• Calories: 480
• Sugar: 8g
• Sodium: 420mg
• Fat: 22g
• Saturated Fat: 9g
• Unsaturated Fat: 11g
• Trans Fat: 0g
• Carbohydrates: 62g
• Fiber: 4g
• Protein: 12g
• Cholesterol: 30mg

Keywords: caramelized onion pasta, garlic spaghetti, sweet onion spaghetti