These flat sheets are made from a similar rice flour dough, which is pressed between bamboo mats to get flattened. The mats leave a distinct basket weave impression on the paper. When dipped in lukewarm water to rehydrate, they turn soft, sticky, and almost clear. They dry in seconds, developing a tacky, pliable skin that adheres well to itself. How they’re used: Rehydrated circular sheets are used to wrap Vietnamese summer rolls. Square and triangular sheets are often wrapped around meat for grilling.