Step on the stalk to split it into quarter-sections lengthwise. Take one of the sections and break the stem toward the outside about 2-3 inches from the end. Peel it off the fiber/bark. Keep doing this all the way down. If you try to peel the fibers and bark from the whole stem, you tend to get short pieces, but if you keep breaking the stalk and pulling it off a little at a time, you can get the whole length of the fibers. With a little practice, you can strip a stem like this in less than a minute. After you get the fiber off, rub them between your palms and twist them to get the bark and chaff off the fiber. Hope that made sense, easier to show than explain.