The main ingredient in this relish is Jerusalem artichokes, which are actually a kind of tuber. They are also known as "sunchokes" or topinambours in France. This is a delicious relish which goes particularly well with sausages or hot dogs, but is good with all meats and cheeses. The Jerusalem artichokes have a nice crunch, which is retained in the finished relish. You may notice that this recipe makes a lot of relish. Most people who make this give it as a Christmas gift, so they make a lot so they have enough for their family and enough to give away. You can halve the recipe if you don't think your demand for artichoke relish will be quite that high. The preparation time listed includes the time spent soaking the vegetables overnight.