Cook pasta for 5 to 7 minutes according to package directions, addingsalt to taste if desired. Drain and set aside.
While pasta boils, add the basil, cashews, garlic, lemon juice andsalt to your food processor. Pulse in slightly to mix/chopingredients.
Scrape down the sides of the food processor with spatula and add oil.
Blend together once more until desired paste-like consistency (optional- add water for thinner pesto)
Mix pesto in with pasta, then add tomatoes, olives and mix again.