Soy protein tortillas. Chipotle-lime sunflower seeds. Garbanzo bean dip. These foods were among the options for public school menus that have been presented at the School Nutrition Association's conference in Chicago. As schools struggle to figure out how to get kids to eat more healthful food, more than 7,500 food service directors, cafeteria managers and so-called "lunch ladies" at the conference have been taste-testing recipes that could end up in cafeterias by the fall.