Basil Pesto Pasta with Broccoli and Parmesan

By Coco Kitchen Editorial Team · Scheduled 2026-10-09

Pesto pasta is fast enough for a weeknight and flexible enough for what is in the refrigerator. Fresh basil, Parmesan, garlic, nuts, and olive oil form a savory sauce; broccoli adds color and a tender bite. The most useful technique is saving pasta water, whose starch helps the pesto cling without heating the sauce until it separates.

Pesto is an uncooked sauce, so high heat can darken basil and cause oil to pool. Tossing it with hot pasta off the burner preserves its fresh aroma. Pasta water should be added a little at a time: too little leaves a thick paste, while too much dilutes the flavor. Broccoli can cook in the pasta pot during the final minutes to reduce dishes.

Basil should be dry after washing so water does not dilute the sauce. A little lemon slows flavor dulling and balances Parmesan. If the pesto tastes bitter, add a pinch of salt and a teaspoon of lemon; avoid excessive processing, which can warm the leaves. Toast nuts in a dry pan over medium heat, stirring, until fragrant, then cool before blending.

Equipment

Use a large pasta pot, colander or spider strainer, food processor or mortar and pestle, tongs, and a heat-safe cup for pasta water. If using a food processor, pulse rather than running continuously; the goal is a textured sauce, not a fully liquefied green puree.

Ingredients

• 12 ounces dried fusilli or linguine
• 4 cups small broccoli florets
• 2 packed cups fresh basil leaves, washed and dried
• 1/3 cup toasted walnuts or pine nuts
• 1/2 cup finely grated Parmesan, plus more for serving
• 1 small garlic clove
• 1/2 cup extra-virgin olive oil
• 1 tablespoon lemon juice
• 1 teaspoon kosher salt for pasta water, plus more to taste
• 1/4 teaspoon black pepper

Step-by-step method

1. Step 1: Bring a large pot of water to a boil. Add salt and pasta; cook according to package directions until just shy of al dente. Reserve at least 1 cup pasta water before draining.
2. Step 2: During the last 3 minutes of pasta cooking, add broccoli florets to the same pot. If florets are large, add them 1 minute earlier. Cook until bright green and just tender, then transfer broccoli with a spider strainer or drain carefully with the pasta.
3. Step 3: While pasta cooks, pulse basil, nuts, Parmesan, garlic, lemon juice, and black pepper in a food processor. With the motor off, scrape the sides, then pulse again while drizzling in olive oil. Stop when the mixture is coarse but spoonable.
4. Step 4: Place pasta and broccoli in a warm bowl or return them to the pot off the heat. Add about half the pesto and 1/4 cup pasta water. Toss with tongs until the sauce coats the pasta. Add more pesto and water gradually until the texture is glossy.
5. Step 5: Taste and adjust salt, lemon, or Parmesan. If the pasta seems dry, add another tablespoon of warm water. Do not boil the pesto; residual heat is enough to warm it and soften the broccoli without cooking the basil.
6. Step 6: Serve immediately with Parmesan and a few basil leaves. Keep any extra pesto in a small covered container with a thin film of olive oil on top and refrigerate promptly.

Technique notes

Basil should be dry after washing so water does not dilute the sauce. A little lemon slows flavor dulling and balances Parmesan. If the pesto tastes bitter, add a pinch of salt and a teaspoon of lemon; avoid excessive processing, which can warm the leaves. Toast nuts in a dry pan over medium heat, stirring, until fragrant, then cool before blending. Make one adjustment at a time when learning a new method. Pan size, starting temperature, and the size of the pieces explain many differences in cooking time. Keep notes on what you changed, and use sight, smell, and texture alongside a timer rather than relying on minutes alone.

Prepare ingredients before the pan gets hot. This is especially important for fast stovetop cooking: garlic, sauce, and vegetables should be measured and within reach. When you have to stop and cut something mid-cook, the first ingredients can overbrown before the next ones are ready.

Substitutions and variations

Use baby spinach for part of the basil when basil is expensive, but keep enough basil for the characteristic aroma. Sunflower seeds can replace nuts for a nut-free version. Pecorino can replace Parmesan but is saltier, so use less and taste before seasoning. Add peas, roasted tomatoes, or white beans for a heartier meal.

Choose replacements with similar moisture and cooking time. Add ingredients that soften quickly near the end, and give firmer vegetables a head start. Keep the first variation simple so you can tell which change affected texture. Taste the finished dish before adding extra salt, because packaged condiments may already contribute plenty.

Common problems

• Cooking pesto over a high flame darkens basil and separates the oil. Toss it off heat.
• Adding all pasta water at once can make the sauce thin. Add it a few tablespoons at a time.
• Wet basil waters down the pesto. Dry leaves thoroughly before blending.

If the pan becomes crowded, cook in batches instead of turning up the heat. If the sauce tightens, add liquid a tablespoon at a time. If a component finishes early, move it to a clean plate and return it at the end rather than letting it overcook while the remaining pieces finish.

Storage, reheating, and food safety

Pesto pasta is best fresh. Refrigerate leftovers within 2 hours and use within 3 to 4 days. Reheat gently in a skillet with a splash of water; stir in a small spoonful of fresh pesto after heating to restore aroma. USDA FSIS guidance recommends reheating leftovers to 165°F. Store unused pesto covered in the refrigerator for up to 3 days.

Cool leftovers in shallow containers and refrigerate them promptly. Reheat only the portion you plan to serve. If a food contains meat, fish, eggs, or dairy, use a thermometer when guidance specifies a safe internal temperature. Do not use smell alone to decide whether stored food is safe.

Related recipes and guides

Continue with how to season food in layers, safe leftover storage, and how to sauté vegetables without sogginess.

Food safety reference

Refrigerate cooked pasta and pesto promptly, within 2 hours, and reheat leftovers to 165°F. Keep fresh basil and cheese chilled until use. See the USDA FSIS safe temperature chart and leftovers guidance.