Spaghetti With Walnut Sauce Recipe: Nutty Richness in Every Bite

This rich pasta dish transforms simple spaghetti into an elegant meal with its velvety walnut sauce. The combination of toasted walnuts and creamy base creates a nutty richness that coats every strand perfectly.

I developed this recipe to showcase how a handful of quality ingredients can create restaurant-quality results at home. The sauce comes together quickly while the pasta cooks, making it ideal for weeknight dinners that feel special.

Ingredients for Spaghetti with Walnut Sauce

A handful of quality ingredients transforms simple pasta into restaurant-worthy elegance in minutes.

The walnuts are the foundation here—splurge on fresh, high-quality walnuts from Whole Foods or a specialty grocer. Older walnuts turn bitter, so check the packaging date. Diamond Crystal kosher salt is the standard in professional kitchens for its clean taste and even distribution. For the Parmesan, Parmigiano-Reggiano is non-negotiable; pre-grated simply won’t melt as smoothly into the sauce.

No heavy cream? Full-fat coconut milk offers a dairy-free alternative with similar richness. Walnut shortage? Pecans or hazelnuts work, though the flavor profile shifts slightly. The nutmeg can be omitted if you dislike its warmth, but a pinch of cinnamon adds an interesting depth. For a lighter version, half-and-half substitutes adequately, though the sauce will be less velvety.

The sauce keeps 3-4 days refrigerated in an airtight container. Freezing isn’t recommended—cream separates. Toast extra walnuts separately and store at room temperature for 1 week to sprinkle over leftovers. Always reserve pasta water fresh; it loses its starch power as it cools.

Step-by-Step Instructions for Spaghetti with Walnut Sauce

This method ensures a creamy, nutty sauce that clings perfectly to al dente pasta.

Step 1: Toast the Walnuts to Perfection

Heat a large skillet over medium heat and add the 1.5 cups Walnuts. Toast for 5-7 minutes, stirring frequently, until they become golden brown and emit a rich, nutty aroma. Watch closely—walnuts burn easily.

Immediately transfer the toasted walnuts to a plate to cool. This prevents them from overcooking in the residual heat of the pan. The Extra-Virgin Olive Oil will be added later, so don’t introduce it yet.

Step 2: Cook the Spaghetti Al Dente

Bring a large pot of water to a rolling boil and add the 12 oz Spaghetti along with 1.5 tsp Salt. Cook according to package instructions, but stop 1 minute early to ensure it finishes cooking in the sauce.

Before draining, reserve ½ cup of the starchy Pasta Water—this is essential for achieving the proper consistency in your walnut sauce. Drain the spaghetti but do not rinse; the surface starch helps the sauce adhere.

Step 3: Sauté Garlic and Build the Sauce Base

In the same skillet used for toasting, heat the 2 tbsp Extra-Virgin Olive Oil and 4 tbsp Unsalted Butter over medium-low heat until the butter melts. Add the minced 3 cloves Garlic Cloves and cook for 30 seconds until fragrant but not browned.

Stir in the 1 cup Heavy Cream and bring to a gentle simmer. This creates a rich, velvety base for the walnut sauce. Avoid boiling, as it can cause the cream to separate.

Step 4: Blend the Walnuts and Combine

Transfer the toasted Walnuts to a food processor or blender. Pulse until finely ground but not pasty—you want texture, not a smooth paste. Add the ground walnuts to the cream mixture in the skillet.

Stir in the 0.75 cup Parmesan Cheese, 0.5 tsp Black Pepper, and 0.25 tsp Nutmeg. Cook for 2 minutes, stirring constantly, until the sauce thickens slightly. The nutmeg adds a subtle warmth that complements the walnuts beautifully.

Step 5: Finish with Pasta and Garnish

Add the drained spaghetti to the skillet and toss to coat evenly in the sauce. If the sauce is too thick, gradually add the reserved Pasta Water, 1-2 tablespoons at a time, until it reaches a silky consistency that clings to the pasta.

Taste and adjust seasoning if needed. Transfer to serving plates, garnish with the 0.25 cup Fresh Parsley, and serve immediately. The parsley adds a fresh, bright contrast to the rich, nutty sauce.

Perfect Pairings for This Recipe

Side Dish Ideas

A simple arugula salad with lemon vinaigrette cuts through the richness beautifully. I toss 4 cups baby arugula with 2 tbsp olive oil and 1 tbsp fresh lemon juice. The peppery bite provides perfect contrast. 🥗

Bread Pairings

Serve with warm garlic bread to soak up any extra sauce. I use a crusty Italian loaf brushed with 3 tbsp garlic butter and toasted for 5 minutes at 375°F. It’s my go-to for pasta nights.

Wine Pairings

An Italian white like Pinot Grigio from Alto Adige offers crisp acidity that balances the creamy walnut sauce. For red lovers, a light Chianti Classico with its bright cherry notes works surprisingly well. 🍷

Vegetable Sides

Roasted asparagus with a squeeze of lemon complements the dish’s richness. Toss 1 lb asparagus with 1 tbsp olive oil and roast at 400°F for 12 minutes. The char adds texture contrast.

Finishing Touches

Add crushed red pepper flakes at the table for heat—about ½ tsp adds a nice kick. A drizzle of high-quality olive oil enhances the nutty flavors. I always finish with extra Parmesan cheese for serving. 💫

Frequently Asked Questions