Horse Radish

Scraping the barrel a bit. It's definitely getting harder to find new species to snap given that my entomological skills are practically zero. So I've been trawling my photos for previously rejected material. This is one such: Horse-radish, Armoracia rusticana, growing on the site of a demolished power station on the north shore of the Loughor Estuary in South Wales at Burry Port. Its huge leaves are the distinctive feature, the flowers being rather dull white racemes of the typical crucifer sort. 
It's the tap root that you want. Long and usually very thin. We have some in the garden which never flowers and invariably gets demolished by the slugs and snails. It was introduced from south east Europe.