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Caramelised Onion and Garlic Spaghetti

4.8/5
Caramelised Onion and Garlic Spaghetti
⏱️
40min Time
👥
4 servings Servings
🟡
Medium Difficulty
💰
Moderate Cost
🔥
450 kcal Calories

Indulge in the rich, comforting flavours of Caramelised Onion and Garlic Spaghetti, a dish that can transform any ordinary dinner into a gourmet experience.


Ingredients

4
  • 300g spaghetti
  • 4 large onions, thinly sliced
  • 4 cloves garlic, minced
  • 4 tablespoons olive oil
  • 2 tablespoons balsamic vinegar
  • Salt to taste
  • Pepper to taste
  • Fresh basil leaves, for garnish
  • Grated Parmesan cheese, for serving (optional)

Instructions

1

In a large pot, bring salted water to a boil and cook the spaghetti according to package instructions until al dente.

2

In a large skillet, heat the olive oil over medium heat. Add the sliced onions and a pinch of salt, cooking them slowly until they turn golden and caramelised, about 20-25 minutes.

3

Stir in the minced garlic and cook for an additional 3-4 minutes until fragrant. Add balsamic vinegar, salt, and pepper to taste.

4

Once the spaghetti is cooked, reserve a cup of pasta water, then drain and add the spaghetti to the skillet. Toss to combine, adding reserved pasta water if needed to reach desired consistency.

5

Serve immediately, garnished with fresh basil and grated Parmesan cheese if desired.

Kitchen Tools

  • Large pot
  • Skillet
  • Colander
  • Spatula
  • Knife
  • Cutting board

Chef's Tips

For extra sweetness, try adding a pinch of sugar while caramelising the onions.

Make sure to cook the onions slowly on low to medium heat to prevent burning.

🔧 Troubleshooting Tips

If the sauce is too thick, add reserved pasta water gradually until you reach the desired consistency.
If the flavour is too strong, balancing it with a touch more vinegar can help.

🔄 Recipe Variations

Add sautéed mushrooms or spinach for extra flavour and nutrition.
Incorporate protein such as grilled chicken or chickpeas for a heartier meal.

🥗 Healthy Alternatives

Use whole-grain spaghetti for added fibre and nutrients.
Replace olive oil with a combination of vegetable broth and a small amount of oil for lower fat content.

🍽️ Serving Suggestions

Nutrition Facts

450
Calories
12g
Protein
75g
Carbs
15g
Fat

🥗 Suitable Diets

Vegetarian

🎨 Presentation Ideas

Chopped fresh parsley or thyme for added colour and flavour.
Crushed red pepper flakes for a bit of spice.

📦 Storage & Conservation

Store leftovers in an airtight container in the fridge for up to 3 days.
Reheat gently on the stovetop with a splash of water or broth to prevent drying out.

♻️ Leftover Ideas

Mix with scrambled eggs for a breakfast dish.
Use as a filling for stuffed peppers or omelettes.

⚠️ Common Mistakes to Avoid

Cooking onions on too high heat, which can cause them to burn instead of caramelise.
Not reserving pasta water, which helps make the sauce smoother.

FAQ

Can I use gluten-free pasta for this recipe?

Yes, gluten-free pasta can be substituted easily; just follow cooking instructions on the package.

How do I know when my onions are properly caramelised?

Onions should be a deep golden brown and taste sweet; this usually takes about 20-25 minutes on low to medium heat.

Is it possible to make this dish vegan?

Yes, simply omit the Parmesan cheese or use a vegan substitute.

Can I prepare the caramelised onions in advance?

Absolutely! Caramelised onions can be made ahead and stored in the fridge for up to a week.

What can I serve with caramelised onion and garlic spaghetti?

Consider pairing it with a green salad, garlic bread, or grilled vegetables.

Reviews

Emma
⭐⭐⭐⭐⭐
Apr 24, 2026
This recipe was a hit! The flavours blend perfectly.
James
⭐⭐⭐⭐☆
Apr 27, 2026
Really enjoyed this pasta dish. Will make it again!
Sophia
⭐⭐⭐☆☆
May 4, 2026
It was good, but I expected it to be a bit more flavourful.
Liam
⭐⭐⭐⭐⭐
May 2, 2026
Absolutely delicious! Best spaghetti I've ever made!
Olivia
⭐⭐⭐⭐☆
May 3, 2026
The caramelised onions add such a depth of flavour!
Noah
⭐⭐⭐⭐☆
Apr 26, 2026
Simple yet tasty! Perfect for a weeknight dinner.
Ava
⭐⭐⭐⭐⭐
May 4, 2026
So quick to make and full of flavour. Loved it!
Ethan
⭐⭐⭐⭐⭐
May 3, 2026
My family loved this! A definite keeper!
Mia
⭐⭐⭐⭐☆
Apr 12, 2026
I added some spinach, and it turned out great.
Lucas
⭐⭐⭐☆☆
Apr 24, 2026
It was decent, but I felt it needed some spice.
Isabella
⭐⭐⭐⭐⭐
Apr 16, 2026
An instant favourite! Can't wait to make it again.
Aiden
⭐⭐⭐⭐☆
Apr 10, 2026
Very satisfying and easy to make. Highly recommend.
Layla
⭐⭐⭐⭐⭐
May 2, 2026
A delightful dish; simple but really tasty.
Logan
⭐⭐⭐⭐⭐
Apr 18, 2026
Such an amazing flavour combination! Loved it!
Chloe
⭐⭐⭐⭐☆
Apr 16, 2026
Great recipe! I will definitely be making this more often.
Elijah
⭐⭐⭐☆☆
Apr 17, 2026
Good, but I thought the garlic was overpowering.
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