To prepare pesto, put cilantro, garlic, lemon juice, Parmesan cheese, cayenne pepper, pistachios (minus 2 tablespoons), and salt in a food processor or blender. Add about half the olive oil and blend. Add remainder of olive oil and blend until mixture reaches desired consistency.
Prepare Pasta
Bring a large pot of water to a boil. Cook pasta according to package directions; drain.
Return pasta to cooking pot on low heat, add pesto and chicken, heating until warmed through. Add tomatoes. Stir to combine.
Top with reserved 2 tablespoons of nuts then serve. Can be served warm, room temperature or cold as a summer salad.
One serving provides approximately: 265 Calories, 14 g Protein, 30 g Carbohydrates, 4 g Fiber, 10 g Fat (2 g saturated), 25 mg Cholesterol, 3 mcg Folate, 2 mg Iron, 166 mg Sodium