With the red and green and the white this is almost Christmasy looking. I love this myself and I hope that the Zaar folks will find that this is something they like just as well as I do. It quick and simple to do too.
In a skillet over medium-high heat, heat oil. Add crushed garlic and saute 1 minute. Remove the garlic from the skillet and discard.
Add mushrooms and saute 2-3 minutes. Add chicken cubes and saute 2 minutes. Add peppers, onions, and beans and cook 2 minutes. Add vinegar and pesto and heat thoroughly. Serve salad over lettuce. Garnish with walnuts if desired.