http://www.durgan.org/29%20September%202006%20Making%20Horse%20Radish%20Condiment/HTML/index.htm http://xrl.us/rys6 Some of the roots were dug from the plant, which is a perennial. The roots were washed and lightly scraped, then cut in small pieces and put in the blender with sufficient vinegar to make a smooth paste. It is important to complete the process relatively soon after picking the roots, since they get woody if allowed to dry too much. The odour is mouth-watering, and the fumes make the eyes water. Nothing attacks the micture in the jar, kept in the refrigerator. I have kept similar for over a year and it is still high quality. Durgan.