Working one roll at a time, dip wrapper into warm water for three or four seconds, just until it starts to soften. (If the dipping water is too hot, the wrapper edges will curl inward.) Place it on the towel. To make the rolls shown in my images, put one mint leaf in the center of the wrapper. Line up three cucumber slices on either side. Top with grated carrot for a high-contrast background. Without overfilling the roll, add greens, noodles, and if desired an extra herb for decoration.