Anandakanda 1.4.85

1.4.85

tadgarte ca puṭaṃ deyaṃ tuṣakārīṣavahninā /
dinānte tatsamuddhṛtya pūrvavanmardayetpacet //

and in that pit, heat should be applied with a fire of chaff and dried cow dung. / At the end of the day, having extracted it, one should grind and cook it as before.