Cook pasta according to package directions in salted water. When al denté, drain and rinse the pasta in cold water. Transfer the pasta to a medium mixing bowl and toss it in 1 teaspoon of oil to prevent it from sticking. Store in the refrigerator while preparing the pesto.
Add all cashew pesto ingredients to a food processor. Process on high for 1-2 minutes, pausing once or twice to scrape down the sides, until the pesto ingredients appear finely minced.
Remove the pasta from the fridge and add the pesto and the rest of the salad ingredients to the pasta. Use a spatula or other smooth utensil to gently toss all salad ingredients together until well combined.
Transfer the salad to a desired serving bowl, garnish with reserved basil leaves, and serve. Taste the salad and add more lemon juice or vinegar, salt, or pepper to taste.
Store leftovers in an airtight container in the refrigerator for up to 3 days.
Notes
If using your premade pesto, use ⅔ cup (5-6 ounces) and skip instruction 2.
Nutrition facts may vary based on the brands and ingredients used.