Anandakanda 2.4.23

2.4.23

jambīrair āranālair vā mṛgadūrvāthavā dravaiḥ /
piṣṭvā piṣṭvā pacedruddhaṃ sagandhaṃ ca catuṣpuṭaiḥ //

With lemon or sour gruel, or juices of mṛgadūrvā, / grinding it again and again, sealed with sulfur, one should cook it through four incinerations.