Step 1

Spray large skillet with cooking spray. Heat over medium-high heat. Add onion; cook and stir 5 minutes, or until tender.

Step 2

Add tomatoes and simmer 5 minutes, or until slightly thickened. Stir in pesto just before serving.

Step 3

Serve with 1 pound dry pasta (such as fusilli, spaghetti or penne), cooked according to package directions. May also be served over cooked chicken breasts or fish.