July 13: National French Fry Day Food Holiday A French Fry may be made of regular potato or sweet potato, but never sour potato! Recipes: French Fries by Epicurious.com Crispy Sweet Potato Fries by CookieandKate.com French Fries by MarthaStewart.com Sweet Potato Fries by ThePioneerWoman.com Social: Tweet Back to the month page! You know there's more stuff to click!