Sonth (also known as Sounth or Sunthi) is made by drying and grinding the rhizome of Zingiber officinale, a plant native to South and Southeast Asia. It forms a fine, beige powder with a sharp, warm aroma. Sonth naturally contains fiber, potassium, iron, manganese, and small amounts of vitamin B6. Commonly added to spice mixes, chutneys, and flavored powders for its bold, earthy taste..