• Cook pasta according to package directions; drain, reserving 1/4 cup cooking liquid.
• Meanwhile, in blender, purée pesto, avocados, olive oil, lemon juice, salt and pepper until smooth.
• Toss together pasta, reserved cooking liquid and avocado mixture until well coated. Add cherry tomatoes and chives; toss gently.

Tip: Garnish with lemon zest if desired.