Choose a short pasta that holds the pesto

Fusilli, rotini, cavatappi, casarecce, radiatori, orecchiette, campanelle, and small shells are all excellent choices. Use your favorite short pasta, ideally one with curves, ridges, or openings that can capture the pesto and tomato juices.

Choose a pasta shape close in size to the halved cherry tomatoes. This makes the salad easier to toss, serve, and eat.

Cook the pasta until tender but chewy

Pasta firms as it cools, so avoid undercooking it aggressively. Cook it according to the package directions, then taste a piece before draining. It should be fully cooked and pleasantly chewy, but not so soft that it breaks apart when tossed.

A very firm al dente texture that works well for hot pasta can seem tough once the pasta has cooled.

Don’t rinse the pasta for this recipe

Rinsing is useful in some cold pasta salads, but it is not the best choice here. The thin layer of starch left on the pasta helps the loosened pesto cling to its surface.

Drain the pasta well, transfer it directly to the pesto, and toss while it is still warm. The pasta will absorb some of the sauce as it gradually cools to room temperature.

Loosen the pesto with pasta water

Pesto straight from the refrigerator or food processor can be too thick to coat an entire bowl of pasta evenly. Reserved pasta water thins it, while the starch helps bind the water and oil into a smoother sauce.

Pro Tip: Reserve more pasta water than you think you will need before draining. Begin with the amount specified in the recipe, then add another spoonful if the pesto still looks thick or the pasta seems dry.

Add the pasta water gradually. It is easy to loosen the pesto further, but difficult to correct if you add too much water at once.

Season the tomatoes before adding them to the recipe

Halve the cherry tomatoes, season them with flaky salt and pepper, and let them rest for a few minutes. The salt draws out some of their juices and seasons the tomatoes more thoroughly.

Add those juices to the pasta along with the tomatoes. They loosen the pesto and give the salad a fresher, more tomato-forward flavor.

Cherry and grape tomatoes are especially convenient because they hold their shape well. Larger garden or heirloom tomatoes can also be used, but remove excess watery pulp before chopping.

Drain the mozzarella and add it last

Fresh mozzarella contains a considerable amount of moisture, especially mozzarella di bufala. Drain it thoroughly before using it, but do not press or squeeze it.

Tear the mozzarella directly over the finished salad just before serving. Any small amount of milky liquid that escapes will mingle with the pesto, while the larger pieces of cheese will retain their creamy interior.

Mozzarella di bufala is my favorite choice, but fresh fior di latte, bocconcini, or small mozzarella balls such as ciliegine are all good alternatives. If you’re using a larger ball of fresh mozzarella, tear it into generous bite-sized pieces just before serving. Avoid low-moisture mozzarella or pre-shredded cheese; neither will provide the soft, milky texture that defines a Caprese salad.

Serve this Caprese Pasta Salad at room temperature

Cold temperatures firm up fresh mozzarella and mute the flavors of tomatoes, basil, pesto, and olive oil. Take the salad and the mozzarella out of the fridge about an hour before serving.

When time is short, keep the sealed container of mozzarella in a bowl of warm—not hot—water for 20 to 30 minutes. This gently warms it without heating or melting the cheese.

Make-ahead tips

You can combine the pesto-coated pasta and seasoned tomatoes several hours in advance. This also makes the salad convenient for meal prep, although I recommend keeping the arugula, basil, and mozzarella separate until you’re ready to eat. Cover and refrigerate them until about an hour before serving.

Wait to add the arugula, fresh basil, mozzarella, and pistachio garnish until shortly before the salad goes to the table. This keeps the greens fresh, the basil bright, the pistachios crunchy, and the mozzarella soft.

Give the salad a thorough but gentle toss before serving. Taste and add flaky salt, pepper, pesto, or olive oil as needed because pasta continues absorbing the dressing as it rests.

How to refresh leftover pesto pasta salad before serving

Refrigerated pesto thickens, and the pasta will continue to absorb oil and moisture overnight. Let leftovers return toward room temperature, then loosen them with a spoonful of pesto or a drizzle of extra-virgin olive oil and a small splash of water.

Add fresh basil, arugula, or pistachios to restore some of the salad’s original color and texture. For the best quality, plan to eat leftovers within two days.

Substitution tips

• A prepared basil pesto is the easiest substitute for pistachio pesto. Choose one with a fresh green color and a short ingredient list, and loosen it with pasta water in the same way.
• Baby spinach can replace the arugula, although it won’t provide the same peppery contrast. Toasted almonds or pine nuts can replace the pistachios used as a garnish.
• For a gluten-free Caprese pasta salad, use a short gluten-free pasta that remains firm after cooling. Cook carefully and start checking it earlier than the package time, because some gluten-free pastas soften quickly.

Keep this salad chilled when taking it outdoors

Because this salad contains fresh mozzarella, keep it refrigerated or in a well-packed cooler until shortly before serving. Return leftovers to the cooler promptly rather than leaving the bowl in direct sun or summer heat.

For another easy salad that works especially well at barbecues and potlucks, try my Easy Tomato Corn Salad.

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FAQ

Can I make Caprese Pasta Salad ahead?

Yes. You can assemble the pesto-coated pasta and tomatoes several hours ahead and refrigerate. For the freshest texture, add the arugula, basil, mozzarella, and pistachios shortly before serving.

Take the salad out of the refrigerator about an hour before eating so the pesto can soften and the flavors can deepen. Toss well and add a little extra pesto or olive oil if the pasta looks dry.

Can I use store-bought pesto?

Yes. A good-quality prepared basil pesto is the easiest substitute for homemade pistachio pesto.

Because prepared pesto can be quite thick, loosen it with a spoonful or two of reserved pasta water before tossing it with the pasta. Taste before adding extra salt because commercial pesto is often saltier than homemade.

The flavor will be more traditionally basil-forward, while the pistachio pesto recipe gives the salad a richer, nuttier character.

Does Caprese Pasta Salad need balsamic vinegar?

No. Although balsamic vinegar is common in many Caprese pasta salad recipes, it isn’t needed in my version.

In this recipe, lemony pistachio pesto and the juices from the seasoned tomatoes provide enough brightness and acidity. Skipping balsamic also preserves the salad’s fresh green color and allows the delicate flavor of the mozzarella to remain prominent.

For another summer recipe that puts tomatoes and pesto front and center, try my Heirloom Tomato Crostata with Homemade Pesto.