The ans is - Gorse
Which flowering plant in the pea family, cultivated as feed for cattle, horses, sheep, and goats, is known in the UK, Australia and New Zealand as lucerne, as lucerne grass in south Asia and as Kuthirai Masal in Tamil?
The dried and grated root of which plant is baked to make cassava bread, and is used to make a beverage called piwarry from its fermented juices?