Tokoroten, written in Japanese as ところてん, 心太, 心天, or 瓊脂, is food made by boiling seaweed such as tengusa (Gelidiaceae) and ogonori (Chinese moss) until they melt and produce agar, which is then cooled down until set.
ところてん（心太または心天、瓊脂）は、テングサやオゴノリなどの海藻類をゆでて煮溶かし、発生した寒天質を冷まして固めた食品。