Anandakanda 1.9.119

1.9.119

mūṣāyām andhrayet paścātpacetkaukkuṭike puṭe /
tamādāya varānīrair bhāvayecca trisaptadhā //

then seal it in a crucible and bake it in a kukkuṭa puṭa. / Taking it, one should levigate it twenty-one times with triphalā juices.