Common Bistort (Persicaria bistorta), is a small wildflower native to Europe. It grows on moist soils as a wildflower throughout the centeral regions of the continent. Because the flowers tend to be showy, the plant has also been cultivated as a garden herb.
Turns out that common bistort was used in Northern England to make a bitter pudding during Lent. This pudding was made from the plant's leaves, some oatmeal, egg and a few other herbs. It is also the principle ingredient in dock pudding or Easter-Ledge Pudding. For those that fancy making this dish, these are the ingredients:
60g each of finely chopped bisort, nettle and dandelion leaves
6 large blackurrant leaves, finely chopped
1 leek finely chopped (or about 12 ramson leaves)
100g whole barley
1 tsp salt
butter or bacon fat to fry
Common Bistort goes by other names, depending on where you find it. It has been called Adderwort, Dragonwort, Easter giant, Easter ledge, Gentle dock, Great Bistort, Osterick Oysterloit, Passion dock, Pink pokers, Pudding grass and Water ledges, amoung others. Most of these names are in reference to the fact that the plant has been used to make the bitter tasting pudding mentioned earlier.