Caramelized Onion Pasta

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Caramelized Onion Pasta

Easy creamy caramelized onion pasta made with an irresistible silky onion sauce. It feels fancy enough for company but is simple enough for a weeknight dinner. Gourmet vibes with minimal effort!

Step-by-step photos can be seen below the recipe card.

Prep Time15

Cook Time45

Total Time1

Course: dinner

Cuisine: American

Keyword: caramelized onion pasta

Servings: servings

Ingredients

4 tablespoons butter
4 large sweet onions sliced thin
3 cloves garlic minced
12 ounces dry spaghetti
1/2 cup olive oil
3 egg yolks
1 & 1/4 cups reserved pasta water
3/4 cup grated Parmesan
salt and pepper to taste
fresh chopped parsley for garnish

Instructions

In a large nonstick skillet over medium heat, melt the butter. Once bubbly, add the sliced onions and sauté for 10 minutes. Reduce the temperature to medium-low and continue cooking, stirring every so often until caramelized, about 30 more minutes. Stir in the garlic until fragrant, 20-30 seconds.
Toward the end of cooking the onions, prepare 12 ounces of dry spaghetti in salted boiling water and cook until al dente. Reserve 1 & 1/4 cups of the pasta water, then drain.
In a blender, combine the caramelized onions, olive oil, egg yolks, Parmesan, 1 cup of pasta water, and salt and pepper. Blend until smooth. Add more water to thin it out, (only if necessary). Add water to the blender in stages, so the sauce isn't runny.
Add warm cooked spaghetti and the onion sauce back to the skillet to warm through over low heat, about a minute.
Garnish with fresh chopped parsley and enjoy!

Notes

Slice the onions as evenly as you can so they caramelize at the same rate.
Sub in your favorite pasta shape or use gluten-free pasta.
Add an extra splash of pasta water when reheating to bring back the silky sauce.

Nutrition