The origin and etymology of Ṭam Dil are shrouded in myth. Folklore has it that a married couple had a jhum plot in this small valley surrounded by small steep hills. The man unfortunately died leaving the wife to care for the crops alone. In the middle of the field was a robust mustard plant, conspicuously bigger than any other plants. One night the widow has a visitation by her husband, who informed her to take special care of the giant mustard plant as it was a harbinger of immense blessing. On the wake, she did as told, and the plant thrived very well. As time went, the widow remarried but the new husband objected to any thing reminiscence of the deceased husband, and so he plucked the plant up by the roots and discarded it. The vast hole left in the ground was then soon filled by water (seeping from the plant, according to some versions; from the ground itself, in another version) to become an exquisite lake. Hence the name of Ṭam Dil, for the "lake of the mustard".