Not sure if it will work on fire but i think it will. i saw on tv a ceramic coated iron skillet They said they are for people who dislike normal iron skillets or for some reason can not cook with them. i am thinking there coated as to not pick up iron in the food. But also though i am properly wrong i do not think the new iron skillets put off iron in the food. Check this link out it is for enamel coated iron skillets might ask your doctor before buying.
http://www.amazon.com/Enamel-Coated-.../dp/B000N4YD9W