On "Iron Chef," food superstars Comerford, Mario Batali, Bobby Flay and Emeril Lagasse meet in Washington for a trip to the White House. The first lady, whose domestic agenda includes promoting healthy eating, shows up in a theme-appropriate orange dress reminiscent of a crisp vegetable. She informs the chefs that the secret (and required) ingredient for the food competition -- in which three judges decide whose dishes are most delicious -- is anything in the White House garden.
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