Mangel-wurzel

Mangelwurzel or mangold wurzel (from German Mangel/Mangold, "chard", and Wurzel, "root"), also called mangold, mangel beet, field beet and fodder beet, is a cultivated root vegetable derived from Beta vulgaris. Its large white, yellow or orange-yellow swollen roots were developed in the 18th century as a fodder crop for feeding livestock.

Mangel-wurzel in Supervolcano
During the second winter after the eruption of the Yellowstone Supervolcano, Jim Farrell spoke of raising parsnips and mangel-wurzels and Andean potatoes at a Guilford, Maine town meeting. All ripened faster than crops the town was used to growing and had a good chance of surviving the shortened growing season. The next summer every house had a garden and grew mangel-wurzels along with other vegetables that had a chance of maturing before winter came.