Anandakanda 2.1.21

2.1.21

tamādāya ghṛtaistulyair lohapātre kṣaṇaṃ pacet /
baddhvāgninā drutaṃ taṃ vai hyajākṣīre vinikṣipet //

Taking it, one should cook it for a moment with equal clarified butter in an iron vessel. / Melted by applying fire, one should surely drop it into goat's milk.