Host Laura Theodore prepares a delightful mid-day meal. Special guests: T. Colin Campbell, Ph.D. and Rachelle Carson-Begley. Menu features a gluten-free, vegan "Zucchini Summer Quiche," crunchy "Jicama and Spinach Salad" and "Cranberry-Pecan Quick Biscuits." "Chilled Avocado Soup" adds a refreshing touch to this warm weather menu.