team one mario batali and emeril lagasse.titors, white house ch comerford and bobby flay. why? a white house version of the food network's popular showdown, "iron chef." >> your secret ingredient is anything from the white house garden. >> reporter: the challenge gather from the white house garden. that was planted just last spring. it's wielded more than 1,000 pounds of produce. not too much honey from white house bees. >> at first i thought it was going to be -- we would be able to find two, three things we could use from the garden. but, in fact, you had the tomatoes the cabbage and it kind of went on and on. >> the battle begins. >> reporter: we learned that street fighters batali and lagasse had secretly horded an ingredient. but with the clock ticking, comerford uses asian ingredients. but batali has a secret ingredient, too. >> what are you working on? >> reporter: southwest cooker flay and lagasse sneaks carrots into the new orleans doughnuts. >> the ingredients tasted so good. it's amazing when you're able to pick so