Anandakanda 1.4.491

1.4.491

tata uddhṛtya kṣiped vajramūṣāyāṃ vipaceddinam /
karīṣāgnāviti punar mardyaṃ pācyaṃ tridhā priye //

Then having extracted it, one should place it in a diamond crucible and cook for a day / in a fire of dry cow dung; thus it is to be ground and cooked three times again, O dear one.