Anandakanda 2.8.64

2.8.64

ḍolāyantre divārātraṃ samuddhṛtya punaḥ kṣipet /
vajrakande mṛdā kandaṃ liptvā gajapuṭe pacet //

in a swing-apparatus for a day and night; extracting it, one should deposit it again / inside a vajrakanda; coating the tuber with clay, one should cook it in an elephant-pit.