Anandakanda 2.1.97

2.1.97

mātuluṅgadravairvātha jambīrotthadravaiḥ pacet /
lohapātre pacettāvadyāvatpātraṃ sulohitam //

or cook it with the juices of citron or with juices arising from lime; / one should cook it in an iron vessel until the vessel is thoroughly red