Nutritious recipes

First lady Michelle Obama and school children pose for a photograph with freshly-harvested vetables on the South Lawn of the White House on October 29, 2009 in Washington, DC. (Mark Wilson/Getty Images)

San Francisco Student Cooks Compete For White House Prize

Perhaps one of the tougher elements of the contest is that the recipes will need to pass muster with a hard-to-please audience: kids.